A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

A solemn, monumental, kitschy palace of worship honoring victory in the Great Patriotic War.

Gargantuan home of Russian science.

One of the world's tallest statues is also one of its most hated.

Stalinist skyscraper built with help of cryotechnology.

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.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This ordinary street was made infamous by a legendary visit from the devil.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Hundreds of Buddhas in a re-discovered Indonesian temple.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Although it has never been a secret ninja base, this shrine still has plenty of tricks up its sleeve.

Modest by day, illuminated majestically at sunset.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

Memorial to the father of the Republic of China.

A fake Transylvanian castle houses a cathedral of antlers.

This Transylvanian church has changed its denomination four times.