Explore the atmospheric ruins of an abandoned convent in the dense forests of Mexico's first national park.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

The only castle in North America to ever house European sovereigns.

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

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

This skewed English house has looked like it's going to fall over for centuries.

One of England's most famous churches hides a pair of little known architectural treasures.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

Long tunnels run under the ancient chariot racing circuit to the tower.

Stunning Roman aqueduct used for 1900 years and still standing.

Come for the flowers, stay for the bats!

The ruins of an ancient stadium that hosted gripping chariot and horse races.

Barça football fans might see the insignia hidden in a church window as a divine sign.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

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

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

A plaque claims this artwork outside a children's hospital was used in the 1998 Quidditch World Cup.

17th-century merchants in Bristol nailed their deals by placing money on these pedestals.

Banksy's image of a naked man dangling from the window of a sex health clinic.

The Bristol Camera Obscura housed in an ancient windmill.