OtherCoral Castle
A structure in Florida that the Latvian Edward Leedskalnin built alone over twenty-eight years from limestone blocks weighing up to thirty tons. He worked only at night and stopped if anyone approached. Asked how, he said he had worked out the secret of the pyramid builders. He died in 1951 leaving no drawings and no explanation; an engineering answer is likely and dull, and there is nobody left to test it on.
