It took over half a century but a Russian monument to a famous and tragic space pup finally stands in Moscow.

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.

A two-way chairlift system between Zugliget and the highest point in the city.

The oldest private art gallery in all of Hungary.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A fake Transylvanian castle houses a cathedral of antlers.

This hidden art nouveau gem was designed by an architect in search of a national style.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

The last of Amsterdam's original sea level markers remaining in place.

Sail in for a ’dam good slice.

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.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

The attic of a four-century-old canal house hides a clandestine church.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.