A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Bohemian paradise covered in majestic forests.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The first museum in the world devoted to sexual gadgetry.

Macabre astrological automaton clock dating to the late 1400s.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

The tallest hotel in Europe.

Stalinist skyscraper built with help of cryotechnology.

A monument to the defenders of the Arctic in Murmansk, Russia.

Gargantuan home of Russian science.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

This 15th-century cave complex is one of the very few monasteries to stay open throughout World War II and the Soviet regime.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

Hidden in a metro shop under a shopping mall, this small museum tells the story of one of the world's largest urban transit systems.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Former headquarters of the KGB.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

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

The world's most active stratovolcano is almost always erupting.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.