Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

Historic medieval fortified city in southwest France.

A Gothic cathedral created from volcanic rocks.

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

This massive blockhead sculpture hides an entire library.

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

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

France's most famous cemetery, with some of its most curious tombs.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A shining, cold, black organ lies in San Francisco's financial district.

Fortified medieval tower house with lovely roof garden.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

A fountain standing as a testament to a doomed alliance.

Ancient serpentine sacrifice holder that has stood the test of time.

A marvel of Byzantine engineering under the streets of Istanbul.

This indoor ski resort has a mountain contained inside a mall.

The oldest known university in the world is in Fez, Morocco.

The other side is actually green.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

Traditional 11th-century outdoor tannery.

Pay your respects to a folk-punk legend.

The literary king of the Jazz Age was born in this lovely Minnesota home which still honors his legacy.