Home of the future Emperors of Russia.

The world's first museum dedicated to the work of game-changing naturalist Charles Darwin.

Dozens of padlock-trees along the Moscow River.

The avant-garde design was able to bypass strict Soviet regulations on architecture.

An early-20th-century "dacha" village of quaint cottages curiously located in a modern part of Moscow.

The tallest hotel in Europe.

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

Moscow's imposing monument to the Space Age.

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

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

Legends of time travel and magical woodland creatures bolster the natural charm of this verdant sanctuary in the midst of Moscow.

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

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

Elaborate tile work in this railway station tells the story of Portugal.

A hidden three-foot-wide house separates these two regal churches.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

In the summer, the area around this sculpture transforms into a vibrant concert venue.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.