Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

Try not to get slimed in Tribeca.

Once the most densely populated place in the world, this island is now a ghost town.

An Aztec snake god has taken the material form of an apartment complex.

This lab's maddening silence is good for business but bad for sanity.

Hidden beneath the streets of London is a secret subway that only carried mail.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

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

Mysterious rocks that ring musically when struck.

A trash dump made beautiful by nature's power.

Two stunning 17th-century libraries and a cabinet of curiosities.

A battle between nature and architecture in the Cambodian jungle.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

A seemingly endless landscape of pure salt stretches far across Bolivia.

Dramatic river bend surrounds a natural red-rocked pedestal.

The legendary building that needed ghostly approval before being built.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

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

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

An eerie, derelict amusement park in Berlin.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

The sign at the garden gate reads: "These Plants Can Kill."