Coral Castle is a mysterious castle built by the Latvian-born eccentric Edward Leedskalnin in Miami, Florida. The castle is built from several megalithic stones such as limestone and coral, each weighing several tons. Leedskalnin spent 28 years, from 1920-1958, building his castle and would not allow anyone to see him work on it. He also never revealed how he had raised such heavy stones all by himself. The grounds of the castle consist of 1,100 tons of stones. In 1984, it became a registered National Historic Place. More photos below.
The entrance and the tower.
Stairway leading to the tower at Coral Castle.
These basic mechanical tools were used to slowly assemble and shape the Coral Castle.