Located 4 miles west of the Isles of Scilly in Cornwall is the Bishop Rock, a small rocky ledge jutting out of the sea.
The rock rises from a depth of 45 meter to expose a tip 46 meters long by 16 meters wide. On this narrow ledge stands a lighthouse, which makes Bishop Rock the world's smallest island with a building on it, as recognized by the Guinness Book of Records.
Check out the amazing story of the rock and the lighthouse over at Amusing Planet.
(Image Credit: Richard Knights/ Wikimedia Commons)