The Whiteford Lighthouse off Wales’ Gower Peninsula is the only cast-iron lighthouse in Britain that is surrounded by the sea at high tide. Built in 1865 to indicate the location of Whiteford Point and its shallow waters, this beautiful lighthouse was operational until 1926. Surprisingly, this unique structure served as a target for bomb practice for the Royal Air Force during WWII but remained standing. In 2000, the lighthouse was put up for sale for $1.31 and was bought by a TV company who vowed to renovate it. You can walk to the lighthouse at low tide, but be cautious as silt and rising waters can be dangerous.