The remains of an Aztec school and various intriguing artifacts lie below a modern cultural center.

This sci-fi gazebo located in a Washington power town is made from old bits of industrial electrical equipment.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

This former coal gasification plant found a curious second life as a popular public park.

A short hike into the mountainside forest reveals a decaying 1890s town.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

Though the original building has been demolished, these massive bronze doors were saved.

Common all over Japan, kōbans are small community police boxes, and now one is guarding one of L.A.’s megamalls.

The decor of this Hollywood movie palace just barely predated the opening of King Tut's tomb.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

The world's oldest bookshop still in operation.

An abandoned beach resort in Normandy reclaimed by artists.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

Statue of a decomposing prince that once held his heart in its hand.

Former hunting lodge of a duke who was an avid collector of impressionist works.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

The encased skull that is widely believed to belong to St. John the Baptist.

There has been an astronomical clock on this spot since the 14th century.

A self-built mosaic house and sculpture park.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.