The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

This quirky curiosity shop takes its cues from the world's bazaars.

Private collection of art inspired by cabinets of curiosity.

A mysterious castle built as a monument to lost love.

The second oldest continuously operating bar in Louisiana.

The only rotating bar in New Orleans has been slowly spinning since 1949.

This grand gothic brewery has been pumping out suds for over a hundred years.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

The largest earthwork effigy in the world.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

One person's lost luggage is another person's treasure.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A beautiful geyser under environmental threat.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

A New York garbage depot holds a secret collection of weird and wonderful refuse.

Where America's first doomsday cult awaited the end of the world.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.