Stalinist skyscraper built with help of cryotechnology.

Dozens of padlock-trees along the Moscow River.

The tallest hotel in Europe.

Moscow's imposing monument to the Space Age.

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

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

This unusual elevator doesn’t stop or slow down.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

This massive monument towers over the city as a constant reminder of the lives lost during Algeria's hard-won war for independence.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

A geothermal energy project gone wrong is fracturing the city's picturesque architecture.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This colossal couch is an unlikely monument to Europe's first female Doctor of Law.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

A marvel of Byzantine engineering under the streets of Istanbul.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

An eerie, derelict amusement park in Berlin.

This ghost town in Belgium will lose its street art when it ceases to exist.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.