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

Nature took her revenge on the "Wickedest City in the World."

A submerged archeological park still holds the wonders of a Roman Sodom.

A scale model of Russia so big visitors are offered binoculars to rent so they can see the whole thing.

A magical work of architecture where a wind turbine enables monks to levitate.

A restaurant modeled after feudal Japan, where the waitstaff are trained as ninjas.

A 140-year-old castle with underground caves hidden in San Francisco.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

Fonts are born and bred here at the oldest letterpress type foundry in the United States.

The "Seinfeld" diner.

A gargantuan crystal kingdom.

Once a place of peaceful repose, this sanitarium now faces an uncertain future.

A little known Colombian theme park of giant curiosities.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.