This beautiful Miami garden was designed as a laboratory for tropical plants.

Former villa and estate of James Deering developed to preserve native tropical forests.

Located within a historic park, the beacon is the oldest standing structure in Miami.

With nickel-steel armor and three-inch thick bullet resistant windows, FDR's train was a rolling fortress.

This spectacular track has run continuously since 1882.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A museum dedicated to the alleged Roswell Incident.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Steep canyon walls hide a forested oasis in the West Texas desert.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

This is one really big nut.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The state bird of New Mexico, constructed entirely out of garbage.

This forgotten beach house built to look like a Frank Lloyd Wright masterpiece overlooks a hidden beach.