This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

The original "capsule building" is a masterpiece of Metabolist architecture.

Japanese company creates clone dolls that reside in the "uncanny valley."

Underground farm located in a former bank vault deep within the bowels of Tokyo's business district.

An ordinary pond with fish from out of this world.

This neighborhood thoroughfare is haunted by dozens of homemade monsters.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

1,001 carved statues of the Buddhist God of Mercy, each with a unique face.

Shrine dedicated to boars that is believed to cure foot and leg injuries.

The 10,000 Torii shrine.

The largest volcanic caldera in Japan holds an entire city in its maw.

This ruined Japanese stripclub sits half burnt to the ground.

This "floating railway" is one of the world's oldest monorail systems.

A giant bug impaled on a 75-foot-tall needle.

Climb inside an iron crystal magnified 165 billion times its normal size.

The quirky - and private - constructions of a secluded artist depict the house of God.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

The world's most famous cheese caves.

A beautiful and classically designed villa, with an hourly infestation of monsters.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

One of the greatest maze designer’s greatest mazes.

An art world insider finds himself battling for his artistic home.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

A chapel on a volcanic core, marking the end of a successful journey.