The walls and streets of the ancient city are peppered with penises.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

The final resting place of the great navigator, or maybe his brother.

The world's largest wooden structure.

An ancient Egyptian temple in the middle of Madrid, Spain.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

This coffee shop lies hidden beneath a historic church.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Wild West history in Hollywood style.