A battle between nature and architecture in the Cambodian jungle.

Northern Ireland's Brobdingnagian stepping stones.

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

Famously misunderstood wonder of the ancient world

Try not to get slimed in Tribeca.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Macabre astrological automaton clock dating to the late 1400s.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A massive underwater sinkhole made famous by Jacques Cousteau.

A crumbling hospital from the 1850s on Roosevelt Island.

The fairy tale castle of the "fairy-tale king."

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

World's first "penitentiary," meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

One of only two commuter aerial tramways in the United States.

A modern zoetrope on the New York City subway.

Ride the subways of yesteryear.

More gold than anywhere else, ever.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.