Architecture of Scotland
The architecture of Scotland includes all human building within the modern borders of Scotland, from the Neolithic era to the present day. The earliest surviving houses go back around 9500 years, and the first villages 6000 years: Skara Brae on the Mainland of Orkney being the earliest preserved example in Europe. Crannogs, roundhouses, each built on an artificial island, date from the Bronze Age and stone buildings called Atlantic roundhouses and larger earthwork hill forts from the Iron Age. The arrival of the Romans from about 71 AD led to the creation of forts like that at Trimontium, and a continuous fortification between the Firth of Forth and the Firth of Clyde known as the Antonine Wall, built in the second century AD. Beyond Roman influence, there is evidence of wheelhouses and underground souterrains. After the departure of the Romans there were a series of nucleated hill forts, often utilising major geographical features, as at Dunadd and Dunbarton.
Castles arrived in Scotland with the introduction of feudalism in the twelfth century. Initially these were wooden motte-and-bailey constructions, but many were replaced by stone castles with a high curtain wall. In the late Middle Ages new castles were built, some on a grander scale, and others, particularly in the borders, simpler tower houses. Gunpowder weaponry led to the use of gun ports, platforms to mount guns and walls adapted to resist bombardment. Medieval parish church architecture was typically simpler than in England, but there were grander ecclesiastical buildings in the Gothic style. From the early fifteenth century the introduction of Renaissance styles included the selective use of Romanesque forms in church architecture, as in the nave of Dunkeld Cathedral, followed more directly influenced Renaissance palace building from the late fifteenth century, beginning at Linlithgow. The private houses of aristocrats adopted some of these features and incorporated features of Medieval castles and tower houses into plans based on the French Château to produce the Scots Baronial style. From about 1560, the Reformation led to the widespread destruction of church furnishings, ornaments and decoration and in post-Reformation period a unique form of church emerged based on the T-shaped plan.
After the Restoration in 1660, there was a fashion for grand private houses influenced by the Palladian style and associated with the architects Sir William Bruce and James Smith. Scotland produced some of the most significant British architects of the eighteenth century, including: Colen Campbell, James Gibbs, William Chambers and particularly Robert Adam. They looked to classical models and Edinburgh's New Town was the focus of a classical building boom. The Industrial Revolution transformed Scottish towns, leading to urban sprawl, exemplified by tenements like those of the Gorbals in Glasgow. New towns, of designed communities like New Lanark, developed from 1800 by Robert Owen, were one solution. Sociologist Patrick Geddes preferred "conservative surgery": retaining the best buildings in an area and removing the worst. There was a revival of the baronial style, particularly after the rebuilding of Abbotsford House for Walter Scott from 1816, and a parallel revival of the Gothic in church architecture. Neoclassicism was pursued by William Henry Playfair, Alexander "Greek" Thomson and David Rhind. The late nineteenth century saw some major engineering projects including the Forth Bridge, a cantilever bridge and one of the first major all steel constructions in the world.
The most significant Scottish architect of the early twentieth century, Charles Rennie Mackintosh, developed a unique and internationally influential "Glasgow style". Architects who continued to employ styles informed by the past included James Robert Rhind and James Miller. From the mid-twentieth century, architecture in Scotland became increasingly utilitarian and influenced by modernism. Key Scottish architects in this movement included Thomas S. Tait, James Stirling and James Gowan. The introduction of brutalism led to urban clearances and extensive use of the tower block. The style was also used in new towns like Glenrothes and Cumbernauld, but has received considerable criticism. More recent major architectural projects include the Scottish Exhibition and Conference Centre, Glasgow, the many striking modern buildings along the side of the River Clyde and the Scottish Parliament Building in Edinburgh.
Prehistoric era
Groups of settlers began building the first known permanent houses on what is now Scottish soil around 9500 years ago, and the first villages around 6000 years ago. The stone building at Knap of Howar at Papa Westray, Orkney is one of the oldest surviving houses in north-west Europe, making use of locally gathered rubble in a dry-stone construction. Skara Brae on the Mainland of Orkney also dates from this period and is Europe's most complete Neolithic village. Neolithic habitation, burial and ritual sites are particularly common and well-preserved in the Northern Isles and Western Isles, where a lack of trees led to most structures being built of local stone. From the Early and Middle Bronze Age we have evidence of the occupation of crannogs, roundhouses partially or entirely built on an artificial island, usually in lakes, rivers and estuarine waters. The peoples of early Iron Age Scotland, particularly in the north and west, lived in substantial stone buildings called Atlantic roundhouses. The remains of hundreds of these houses exist throughout the country, some merely piles of rubble, others with impressive towers and outbuildings. They date from about 800 BC to AD 300 with the most imposing structures having been created circa 200–100 BC. In the south and east larger earthwork hill forts survive. There is evidence for about 1,000 Iron Age hillforts in Scotland, most located below the Clyde-Forth line. They appear to have been largely abandoned in the Roman period, but some seem to have been reoccupied after their departure. Most are circular, with a single palisade around an enclosure.Roman and post-Roman constructions
The Romans began military expeditions into what is now Scotland from about 71 AD. In the summer of AD 78 Gnaeus Julius Agricola arrived in Britain to take up his appointment as the new governor and began a series of expeditions to Scotland. Two years later his legions constructed a substantial fort at Trimontium near Melrose. He is said to have pushed his armies to the estuary of the "River Taus" and established forts there, including a legionary fortress at Inchtuthil. Agricola's successors were unable or unwilling to further subdue the far north. The fortress at Inchtuthil was dismantled before its completion and the other fortifications of the Gask Ridge were abandoned within the space of a few years. By AD 87 the occupation was limited to the Southern Uplands and by the end of the first century the northern limit of Roman expansion was a line drawn between the Tyne and Solway Firth. Elginhaugh fort, in Midlothian, dates to about this period as may Castle Greg in West Lothian. The Romans eventually withdrew to a line in what is now northern England, building the fortification known as Hadrian's Wall from coast to coast. Around 141 A.D. the Romans undertook a reoccupation of southern Scotland, moving up to construct a new limes between the Firth of Forth and the Firth of Clyde. The Antonine Wall is the largest Roman construction inside Scotland. It is a sward-covered wall made of turf circa 7 metres high, with nineteen forts. It extended for. Having taken twelve years to build, the wall was overrun and abandoned soon after AD 160. The Romans retreated to the line of Hadrian's Wall, with occasional expeditions that involved the building and reoccupation of forts, until their departure in the fifth century.Beyond the area of Roman occupation, wheelhouses, a round house with a characteristic outer wall within which a circle of stone piers were constructed, with over sixty sites identified in the west and north. Over 400 souterrains, small underground constructions, have been discovered in Scotland, many of them in the south-east, and although few have been dated those that have suggest a construction date in the 2nd or 3rd centuries AD. They are usually found close to settlements and may have been for storing perishable agricultural products. After the departure of the Romans we have evidence of a series of forts, often smaller "nucleated" constructions compared with Iron Age constructions, sometimes utilising major geographical features, as at Dunadd and Dumbarton.
Middle Ages
Medieval vernacular architecture made use of local materials and styles. As in England, cruck construction was used, employing pairs of curved timbers to support the roof, however they were usually hidden from view. In rural areas there was extensive use of turf to fill in the walls, sometimes on a stone base, but they were not long lasting and had to be rebuilt perhaps as often as every two or three years. In some regions, including the south-west and around Dundee, solid clay walls were used, or combinations of clay, turf and stray, rendered with clay or lime to make them weatherproof. With a lack of long span structural timber, the most common building material was stone, employed in both mortared and dry stone construction. Different regions used broom, heather, straw, turfs or reeds for roofing.The introduction of Christianity into Scotland from Ireland, from the sixth century, led to the construction of basic masonry-built churches beginning on the west coast and islands. Medieval parish church architecture in Scotland was typically much less elaborate than in England, with many churches remaining simple oblongs, without transepts and aisles, and often without towers. In the Highlands they were often even simpler, many built of rubble masonry and sometimes indistinguishable from the outside from houses or farm buildings. However, from the eighth century, more sophisticated buildings emerged. Early Romanesque ashlar masonry produced block-built stone buildings, like the eleventh century round tower at Brechin Cathedral and the square towers of Dunblane Cathedral and The Church of St Rule. After the eleventh century, as masonry techniques advanced, ashlar blocks became more rectangular, resulting in structurally more stable walls that could incorporate more refined architectural moulding and detailing that can be seen in corbelling, buttressing, lintels and arching. At the same time there was increasing influences from English and continental European designs, such as the Romanesque chevron pattern detailing on the piers in the nave of Dunfermline Abbey, which were modelled on details from Durham Cathedral, and the thirteenth century East-end of Elgin Cathedral, which incorporated typical European Gothic mouldings and tracery. In the fifteenth century continental builders are known to have been working in Scotland. French master-mason John Morrow was employed at the building of Glasgow Cathedral and the rebuilding of Melrose Abbey, both considered fine examples of Gothic architecture. The interiors of churches were often elaborate before the Reformation, with highly decorated sacrament houses, like the ones surviving at Deskford and Kinkell. The carvings at Rosslyn Chapel, created in the mid-fifteenth century, elaborately depicting the progression of the seven deadly sins, are considered some of the finest in the Gothic style. Late Medieval Scottish churches also often contained elaborate burial monuments, like the Douglas tombs in the town of Douglas. The early sixteenth century saw crown steeples built on churches with royal connections, symbolising imperial monarchy, as at St. Giles Cathedral, Edinburgh.
Scotland is known for its dramatically placed castles, many of which date from the late medieval era. Castles, in the sense of a fortified residence of a lord or noble, arrived in Scotland as part of David I's encouragement of Norman and French nobles to settle with feudal tenures, particularly in the south and east, and were a way of controlling the contested lowlands. These were primarily wooden motte-and-bailey constructions, of a raised mount or motte, surmounted by a wooden tower and a larger adjacent enclosure or bailey, both usually surrounded by a fosse and palisade, and connected by a wooden bridge. They varied in size from the very large such as the Bass of Inverurie, to more modest designs like Balmaclellan. In England many of these constructions were converted into stone "keep-and-bailey" castles in the twelfth century, but in Scotland most of those that were in continued occupation became stone castles of "enceinte", with a high embattled curtain wall. The need for thick and high walls for defence forced the use of economic building methods, often continuing the tradition of dry-stone rubble building, which were then covered with a lime render, or harled for weatherproofing and a uniform appearance. In addition to the baronial castles there were royal castles, often larger and providing defence, lodging for the itinerant Scottish court and a local administrative centre. By 1200 these included fortifications at Ayr and Berwick. In the wars of Scottish Independence Robert I adopted a policy of castle destruction, rather than allow fortresses to be easily retaken and then held by the English, beginning with his own castles at Ayr and Dumfries, and including Roxburgh and Edinburgh.
File:Smailholm Tower 22407 from E.jpg|thumb|right|Smailholm Tower near Kelso in the Scottish Borders
After the Wars of Independence, new castles began to be built, often on a grander scale as "livery and maintenance" castles, to house retained troops, like Tantallon, Lothian and Doune near Stirling, rebuilt for Robert Stewart, Duke of Albany in the fourteenth century. The largest number of late medieval fortifications in Scotland built by nobles, about 800, were of the tower house design. Smaller versions of tower houses in southern Scotland were known as peel towers, or pele houses. The defences of tower houses were primarily aimed to provide protection against smaller raiding parties and were not intended to put up significant opposition to an organised military assault, leading historian Stuart Reid to characterise them as "defensible rather than defensive". They were typically a tall, square, stone-built, crenelated building; often also surrounded by a barmkin or bawn, a walled courtyard designed to hold valuable animals securely, but not necessarily intended for serious defence. They were built extensively on both sides of the border with England and James IV's forfeiture of the Lordship of the Isles in 1494 led to an immediate burst of castle building across the region. Gunpowder weaponry fundamentally altered the nature of castle architecture, with existing castles being adapted to allow the use of gunpowder weapons by the incorporation of "keyhole" gun ports, platforms to mount guns and walls being adapted to resist bombardment. Ravenscraig, Kirkcaldy, begun about 1460, is probably the first castle in the British Isles to be built as an Artillery fort, incorporating "D-shape" bastions that would better resist cannon fire and on which artillery could be mounted.