Hidden beneath the streets of London is a secret subway that only carried mail.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

A diverse collection of wax, bone, papier-maché and mummified relics.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

Eclectic musical collection ranging from hurdy gurdies and orphicas to the Rolling Stones Mobile Studio.

Outsider art meets hard scrabble mountain life in this woodcarver's home/art piece.

Few other hotels can rival the grandeur of the Castle in the Rockies.

Fossils, railroads, and waterfalls!

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

Museum in a swimming pool where the water still flows.

The university library shaped like a giant piece of Swiss cheese.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

There are hundreds of secret WWII bases hidden in British forests. Built to fight a Nazi invasion, they remained unknown for decades.

The longest hedge maze in the world.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The first Russian Orthodox church in the Catholic city of Rome in almost a thousand years.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

An odd museum dedicated to French fakes.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

Green labyrinth formed by a karstic maze hidden in a preserved oak forest.

Artist Danielle Jacqui decorates nearly every inch of her home inside and out with her work.

Abandoned railway line circling the city of Paris.

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

This surreal statue brings a famous French novel about a supernatural cad to arresting life.