A watering hole where the options for seating include a bar, patio, or subterranean cave.

A popular tourist cave with a dark past.

A 140-year-old castle with underground caves hidden in San Francisco.

An extraordinary "City of Caves" carved from solid stone.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

The remains of a deserted 1800s farming community can be found in Little River State Park.

The multinational Burger King chain is banned from operating within 20 miles of a family restaurant filed under the same name.

This central Nevada cave is the spiritual home of ancient and enigmatic pictographs.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

Possibly the world's oldest rug, this Egyptian relic is woven entirely from ancient cat hair and once carried a mummified human foot.

These blingy, baubled skeletons lie in glass boxes inside a baroque Bavarian church.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

Abandoned bridge hidden deep in the San Gabriel Mountains.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

At this California chicken ranch, four bucks will get you 18 eggs and a chorus of dancing animatronic poultry.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

The world's largest squirrel statue clutches a pecan bigger than your head.

Where the U.S. government kept its actual treasure, before Fort Knox.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

The great Danube river starts here.

The great polar explorer is remembered in this far northern town, where he embarked on his final expedition.

A South African bar inside a hollowed out 6,000-year-old Baobab.

Last stop before the top of the highest peak in the world.