Edward Leedskalnin (Latvian: Edvards Liedskalniņš) (January 12, 1887 – December 7, 1951) was a Latvian immigrant to the United States and self-taught engineer who single-handedly built the Coral Castle in Florida, added to the National Register of Historic Places in 1984. Leedskalnin was also known for developing theories of magnetism.