Thornborough Bridge

Thornborough Bridge is situated on the original Bletchley to Buckingham road, now bypassed by a modern bridge in 1974 for the A421. The bridge is accessible to pedestrians from an adjacent lay-by.
The bridge straddles the parish boundaries of Thornborough and Buckingham, where the parish boundary follows the line of Padbury Brook, a tributary of the River Great Ouse. Dating back to the end of the 14th century, it is the only surviving mediaeval bridge in Buckinghamshire. The parish division is marked by a boundary stone in the middle of the bridge.
The stone bridge measures approximately long and wide, spanning the river with six low arches
. Three refuges are formed within the parapet on the south side.
The bridge is Grade I listed by English Heritage.