Religious perseverance and cultural coexistence manifest in an architectural gem that multiple wars couldn't topple.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

Structure built from the skulls of vanquished foes.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

A monument on the pavement marks the spot where two cultures that shaped Sarajevo come together.

Celebrated example of Ottoman architecture that also served as a site for brutal massacres.

Oriental bazaar in the heart of Sarajevo.

These warring psychedelic crags commemorate an unsuccessful military operation.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

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

Former headquarters of the KGB.

Moscow's imposing monument to the Space Age.

The tallest hotel in Europe.

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

Some Moscow residents once claimed the bizarre, contorted mass of metal on top of the building was used to manipulate minds.

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

Gargantuan home of Russian science.

Stalinist skyscraper built with help of cryotechnology.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Seven dragon statues—including one that breathes real fire—are scattered throughout the streets of Krakow.

There has been an astronomical clock on this spot since the 14th century.