A hidden "place of interment for gentlemen."

This historic train station has been converted to a locomotive themed hotel.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

A stunning 18th century pharmacy and medieval chemist's collection.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Rummage through this sunken ship, but leave your scuba gear at home.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The return of something once considered a basic part of life.

A mass grave for victims of one of the city’s worst fires.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

This micro-industry of Latino cuisine along Red Hook's Ball Fields represents a victory in a food fight with the city.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

The world's largest wooden structure.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The other side is actually green.

God's Saharan sandbox of wrath.

One of the most spectacular canyons in the world.

A fortified city, home to a remaining population of five families

World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.

Founded as a refugee camp, now a popular tourist spot.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.