Over time, this castle grew to encompass the entire island.

A unique, playful portrayal of Jesus as a backpacking traveler.

Visitors can sit and study the board with this Estonian chess legend and International Grandmaster.

This garden houses the remains of the ancient Greek port of Marseille.

Small church on top of a huge rock column.

The decaying remains of a once-luxurious Soviet spa town.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

A pair of gigantic baby heads greet passengers at Atocha Station.

A lush indoor jungle fills this bustling Madrid transportation hub.

Artist Natividad Sánchez wrote a new ending for one of Roman mythology's tragic love stories.

This unassuming bookstore in the heart of Madrid is one of the oldest in Spain.

Automatons that were once removed after one fell from the building.

This little sun pays homage to a massive gate that once stood at this location.

Order cookies baked by cloistered nuns in a 400-year-old monastery.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'