Built by just one man, the Coral Castle is sometimes called America's Stonehenge.  A fascinating place, here is a summary from Wikipedia:

Coral Castle is an oolite limestone structure created by the Latvian-American eccentric Edward Leedskalnin (1887–1951). It is located in unincorporated territory of Miami-Dade County, Florida, between the cities of Homestead and Leisure City. The structure comprises numerous large stones, each weighing several tons, sculpted into a variety of shapes, including slab walls, tables, chairs, a crescent moon, a water fountain and a sundial. It is currently a privately operated tourist attraction. Coral Castle is noted for legends surrounding its creation that claim it was built single-handedly by Leedskalnin using reverse magnetism or supernatural abilities to move and carve the stones.

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