A striking symbol of the Bulgarian capital.

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

Sofia's legislative center is continuously reinventing itself.

"Holy Wisdom" overlooks the city that became its namesake.

An homage to the medieval rulers of Bulgaria.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

This massive underground salt mine now holds a sci-fi theme park in its depths.

These Stalin-era industrial 'death traps' hang lifeless above the city

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

Unusual building appears to be haphazardly built from randomly piled bricks.

Ancient rock-hewn town that witnessed key events of Georgian history.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

This abandoned airplane hanger is said to have once been a top secret launch facility.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

Oriental bazaar in the heart of Sarajevo.

Despite finally receiving electricity in 1970, this tiny town is now deserted.

Two massive boulders, rocking back and forth with the ebbing of the sea.

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .