A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

Underneath this Byzantinian church lies a necropolis filled with ancient tombs and the ruins of previous churches.

A vast Communist-era exhibition space in the Bulgarian capital.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

After funding was cut for a memorial to the Danish author, the sculptor had his statue ceremonially lowered into the city harbor.

A pair of connected skyscrapers form this symbolic gateway.

A small memorial to a deadly night in Serbia that shook the world before it was swept under the rug.

This now abandoned restaurant provides some of the most amazing views of Lisboa.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This Transylvanian church has changed its denomination four times.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

An ancient knight and a symbol of the city's freedom.

This once architecturally advanced housing complex is now a haven for squatters that still bears the scars of war.

These caves secretly held national treasures during World War II.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The oldest public library in Ireland.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.