Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

A hands-on traveling collection of the innovative devices of yesteryear.

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

A dilapidated dock tells the story of Titanic's missed arrival.

Ride the subways of yesteryear.

A hip bar decorated with walls of golden skulls.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Continuing the tradition of the dime museum in style.

A semi-scholarly approach to sex.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

The final resting place of New Orleans' most famous voodoo priestess.

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

A miniature rainforest is growing inside of a Midtown Manhattan office building.

New York's oldest magic store.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

A layered tribute to the work of mosaicist Isaiah Zagar.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

An enormous, inside-out glass globe built in 1935.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.