A remarkable geological formation resembling a forest made of stone.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

A bike train runs along a disused railway line through the tranquil French countryside.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

This stone complex marks the urban center of a lost civilization.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

The sanctuary holds what was once believed to be the saint's incorruptible tongue.

Be(w)ar(e) the moat around this historic Czech castle.

Massive installation of Europe's negative stereotypes.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

Mysterious painted skulls in Moravia.

A spiral staircase twists to the top of this unusual Czech lookout tower.

A mocking tribute to the past and modern leadership of Prague.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

A Jenga-style cylindrical tower of books that appears to go on forever.

Walk through Czech history in Prague's largest graveyard.

The large collection of pre-Columbian pottery might make you blush.

Lima’s Museum of Anthropology is lined with thousands of elongated human craniums.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

A cluster of granite granaries perched on stilts.

Learn about Iceland's hidden folk at this school dedicated to the study of elves.