The so-called "world's shortest river" is actually a window into a cave.

A 1950s eccentric's vision of Eden preserved as a hiking trail.

Over 120,000 curious objects that have shaped our modern world.

When this test site was abandoned, they didn't even bother to take the rocket with them.

A luxuriant botanical garden below sea level.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.