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

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

Moscow's imposing monument to the Space Age.

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

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

Museum celebrating the achievements of the Soviet space program.

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

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

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

Picturesque intersection of witchcraft and ancient Christianity.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Eighty million natural history specimens call this gargantuan museum home.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Breathtaking and huge 430 year old maps of Italy.

Famously misunderstood wonder of the ancient world

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Take a walk in a recreation of ancient Rome.

Sofia's legislative center is continuously reinventing itself.

A striking symbol of the Bulgarian capital.