The mystifying Coral Castle, created in secret by an architectural genius, Edward Leedskalnin. From 1923 to he single-handedly carved over tons of coral rock into a castle near Miami, and took the secrets of his construction process to his grave.
Coral Castle, Homestead, FL Mystery: How did he do it? The jilted man claimed he knew the secret to the pyramids’ construction. Other details—no mortar, precise seams, physics-defying balancing acts—have also stumped scientists for decades.