A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

The first green space constructed on an elevated viaduct.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

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

Notorious artist squat renovated into legal studios.

The oldest stone house in Paris was built by its most famous alchemist.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A subterranean house of worship carved right out of the bedrock.

Dedicated to the works of the legendary special effects artist.

A historic and beautiful Art Nouveau chamber in a historic railway station.

Macabre astrological automaton clock dating to the late 1400s.

Op-art architecture designed for happiness.

An exotic wildlife habitat right off The Strip.

Visitors can still take a train to this former train station turned museum.

A gigantic teapot sitting on top of a parking garage in the center of Utrecht.

The world's first fish doorbell monitors this water passageway.

This extraordinary project brings water from the Colorado River to Southern California.

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

An eerie natural formation that looks right back at you.

Traces of General Patton’s Mojave Desert training camps for the North Africa campaign.

A bust of the entertainer and politician sits in an alcove at the Palm Springs Airport.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.