For one day every month Barcelona's Estació de França transforms into a market for model trains.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

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.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

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

South Korea's largely symbolic, barely used gateway to the North.

Over 80,000 carved wood blocks make up one of the world's oldest intact Buddhist canons.

A thriving artist's wonderland located just 6 kilometers from Korea's DMZ.

Secret North Korean passage discovered below the world's most dangerous border.

An all-female order shares an ancient culinary art with visitors at their mountaintop monastery.

The darkest building on Earth was built for the snow-white scenery of the 2018 Winter Olympics.

The gravestones in this lost burial ground were bulldozed and replaced with houses and a dog park.

This unique Seattle structure was designed to be the greenest commercial building on the planet.

A 1,000 pound brass bell commemorates a time when this small maritime neighborhood was actually its own separate city.

Always a new use for this old building.

This Cold War siren is one off the last of its kind still standing with its immensely powerful original horn.

A piece of Seattle’s historic Chinatown preserved inside a modern museum.

This graveyard contains markers and monuments dedicated to some of the darkest chapters in Washington's history.

Peruse rare tomes like poetry bound in pearls or books with branches and berries growing out of their spines.

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.

A (slightly) grownup take on the classic retro arcade.

This Seattle museum displays the history of the telephone through an impressive collection of telecom equipment.