At 207 feet, one of the world's longest continuous escalators.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

The oldest continuously operating fish market in the United States.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Two dozen pinball games hidden away inside a most unlikely location.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

Bizarre Cavern.

The remains of a religious colony, its amusement park, zoo, and baseball empire.

Home to drunken tower-climbing goats... seriously.

Walk the whole Mississippi River!

The "Jade Museum" is full of thousands of intricately carved works of art made from various precious stones.

Walk through row upon row of manicured miniature trees at the United States' largest bonsai nursery.

The world's longest known cave system.

Elvis's own personal tropical hideaway.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.