Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A beautiful but toxic fountain of mercury.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This 19th-century fountain's namesake animal isn't what you think it is.

Giant topiary dog once played a role in a terrorist bomb plot.

Hindu temple of the dead home to hundreds of long-tailed macaques.

A sprawling nature preserve harbors the world's only living dragons.

A flooded Mexican cave that hides a river beneath the water.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

These azure waters were thought to lead to the Mayan Underworld.

Frida Kahlo's childhood home, now a museum of her life and works.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

Temples adorned with intricate, erotic sculptures make up one of the "seven wonders" of India.

The ancient water tanks remain some of the ruined city’s most beautiful architecture.

The remains of what was, not so long ago, the world's largest city.

In Namibia there is an installation that explores the intertwined linguistics and existential beliefs of an imaginary community.

Road signs in Namibia mark the location of one of the five major circles of latitude.

The largest known meteorite on Earth was too big to move.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.