This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

A grotesque collection of wax limbs depicting the symptoms of venereal disease.

Where commuters walk through remnants of an ancient Greek necropolis.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

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

Single runway interrupted by a busy road that cuts across its middle.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Perhaps the tiniest sculpture in Saint Petersburg is a little bronze finch inspired by a song.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

This strange statue features a bust of the famous composer plopped atop a woman's body.

The world's oldest known salt mine.

Each year melting snow turns these Austrian hiking trails into scuba zones.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Ruins of an aerial tramway that ran for only eight years.

Walk inside a half mile long crevice right outside the town of Garmisch Partenkirchen.

World's largest barrel containing an inn.

An abandoned train station in Munich constructed for the 1972 Olympic games.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Legendary site where an evil bishop was devoured by rodents.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.