The best collection of Mudéjar building replicas gathered in a theme park in Olmedo.

Human-made caves excavated to hide a secret society of wealthy pagans.

This magical museum celebrates the life and work of a seminal children's book writer (and occasional spy).

A haven for book enthusiasts across the street from Retiro Park.

A series of recreated fortifications mark George Orwell's path through the Spanish Civil War.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A monument at Alicante Marina honors a little-known hero of the Spanish Civil War.

Down this yellow brick road, visitors are treated to toadstool houses and massive mushroom sculptures.

An impressive display of ships and artifacts from the ancient Mediterranean maritime trade.

The world's first electric battery-powered submarine.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

The extensive relics of an ancient Roman and Phoenician fish processing plant hide in a town park.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

This Sri Lankan cemetery is the final resting place of sci-fi legend Sir Arthur C. Clarke.

Does this 10-foot-tall statue carved into a rock face depict a king afflicted by a skin condition or a Buddhist figure?

This peaceful, round shrine in the middle of the Sri Lankan jungle acts as a beacon of peace.

This amazing mountain temple is topped by one of the tallest sitting Buddha statues in the world.

Beautiful and terrifying masks displayed in the island’s only mask library.

No one knows the origin of this creepy little stone man with an oversized phallus.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

Strange rumors surround the artist who created these solemn metal guard dogs.

A whimsical bridge adorned with decorative dragons.