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

A popular swimming hole that hides one of America's most deadly diving spots.

A modernist landscape of water and sci-fi concrete.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Walk 2,300 feet above the ground on the "Troll's Tongue."

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

A battle between nature and architecture in the Cambodian jungle.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This abandoned amusement park was built on a site with a dark history.

Ruins of a German Castle on top of a towering stone pillar.

A layered tribute to the work of mosaicist Isaiah Zagar.

Eighteen miniature death-scene dioramas.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

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

Most-visited and most-photographed slot canyon in the American Southwest.

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

An emerald-green grotto just a short trip from Austin.

Rippling sand dunes frozen in the Arizona rock.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."