20,000 pieces in a Frank Gehry-designed building.

A museum within a museum, devoted to history's most questionable medical devices.

Birthplace of the Tendai sect and home to the marathon monks.

A massive wintry wall of snow up to 66 feet tall flanks a highway through Japan's mountains.

One of the world's largest ancient burial mounds.

Unusual hexagonal rocks formed by cooling lava named for their resemblance to traditional Japanese tatami mats.

A steaming, boiling hellscape sources Hokkaido's thermal baths.

Closed for decades, this strange symbol of Japan's Expo '70 has finally opened its psychedelic insides to the public.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

A charming flea market shop dedicated to retrofuturistic apparati.

An aluminum skeleton brings Chinese mythology to the French shore.

A Gothic cathedral created from volcanic rocks.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

This massive blockhead sculpture hides an entire library.

The famous winding walk at Chartres is surrounded in mystery and myth.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

The largest underground church in Europe.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

This Parisian café sticks almost exclusively to an ethos of reuse.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

One of the greatest maze designer’s greatest mazes.