Ristna LighthouseThe Ristna Lighthouse is a lighthouse located at Ristna Point on the Kõpu Peninsula on the island of Hiiumaa in Estonia.HistoryThe lighthouse was built in 1874, as a result of constant fogs, which made the old Kõpu lighthouse nearly invisible. The main reason for the decision to build the lighthouse was to warn sailors of drifting sea ice; which caused a major obstacle in the Gulf of Finland. The current iron metal structure of the lighthouse was built in 1874. The design of the Ristna Lighthouse was made by Gustave Eiffel. The lighthouse survived World [War I] with small amounts of damage; however, to improve the lighthouse's stability, the structure was cast in concrete in 1920.