This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

One of Europe's oldest libraries.

This bridge was constructed from the rubble of the infamous Bastille.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

The second oldest continuously operating bar in Louisiana.

A cluttered and astounding collection of antiquities and curiosities.

100 year tradition of fist fights, marked by marble footsteps.

A Prada store in the West Texas desert that is never open for business.

The underground sanctuary of a mysterious ancient cult.

Historic funicular railway, believed to be the shortest railroad in the world.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

His music once banned in Communist Cuba, John Lennon is now immortalized in bronze by Castro, who considers Lennon a "fellow dreamer."

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

Concrete strongholds stand guard over the Golden Gate.

The haunting ruins of Jack London's dream house.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

Alleyway plaque commemorating the death of a fictional character in The Maltese Falcon, not far from the author's home.

A village on the east coast of England that has almost completely eroded into the North Sea.

Elevated freight railway turned wildly successful urban park.

Venice's island of the dead.

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

A Nesting Doll of Churches.