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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

France's national museum of scientific and industrial instruments.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

Stunning wetlands ablaze with pink lotus flowers.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

A giant 400-acre preserve in North Florida for displaced wolves.

These rat eating Giant Malaysian Pitcher Plants may have evolved to eat shrew poop.

This abandoned amusement park was built on a site with a dark history.

The arboretum whose marshy soil sucked up the dreams of housing developers.

This massive library holds what was once the largest book collection in the world.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A submerged archeological park still holds the wonders of a Roman Sodom.

Outsider art meets paleontology at this roadside reptile repository.

If astronomy had a ghost, it would look like this observatory.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."