The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The curious underground history of keeping Paris clean.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A museum of carnival attractions where you are invited to ride the rides.

Notorious artist squat renovated into legal studios.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

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

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

A fake town founded by Western movie stars is now becoming a hip desert community.

Despite being a perfectly pleasant place to be, Loyalton can't seem to attract any visitors.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.