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Six white concrete domes standing in the Gulf, several hundred feet offshore from a beach that used to be under them.

A hexagonal brick fortress of 16 million bricks on a sand key 70 miles out to sea, never finished, once a prison for a Lincoln conspirator.

A former research habitat 21 feet down in a lagoon. You scuba to check in. Pizza arrives by diver.

A 50-foot obelisk of 1,500 stones donated from every US state and 21 countries, cemented together in 1943.

A Cold War missile base inside Everglades National Park, with a nuclear-capable missile still in the barn.

Every US president in wax, plus a 60-foot hand-built model of the White House with working chandeliers.