12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

An exotic reptile facility showcasing some of the rarest, most venomous snakes in the world.

The saddest little diner in New York.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

A terrific purveyor of natural history objects and curios.

A collaborative art project that transformed a neighborhood in NYC's Queens.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

The world's largest wooden structure.

An eerie collection of the surviving structures from a past celebration of the future.

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

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

This enormous censer uses a pulley system installed over 400 years ago.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

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

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

An underground city of salt.

These massive moving sand dunes have swallowed an entire village and are still on the run.

This open-air museum was originally a World War II testing ground for German missiles and rockets.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.