Homestead, Florida N 25.362118 / W 80.562392 A three-mile walk down a closed road in the Everglades leads to the unprotected remains of an abandoned rocket factory—including the shell of the largest solid-fuel rocket booster ever built, still sealed inside its 150-foot-deep test silo. The aerospace company Aerojet built the facility in 1963 to produce four test rockets for the space program. Aerojet tested three boosters, nose down, with massive detonations that could be seen 80 miles away. But after NASA decided the liquid-fuel Saturn rockets would perform better in space, Aerojet walked away from the project, leaving filing cabinets, ignition panels, and the case of the fourth solid-fuel rocket booster rusting in the swamp. Enter at your own risk. Free.

Courtesy Jim Sharp Photography/MevoImage.com