When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

An apparition of Virgin Mary in Herzegovina.

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

Explore a traditional Albanian dwelling that pays tribute to the region's rich history.

Depending on the region's rainfall, this church may be partially submerged.

These ancient ruins hide in plain sight next to a dessert shop.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

The historic tower houses of this nearly abandoned Greek town have been compared to the spikes on an iguana's back.

The abandoned summer estate of the former Greek Royal Family.

Local lore says two enemy dragons live within these breathtaking mountain lakes.

Large collection from the 3rd millennium BCE.

Massive, unfinished broadcasting station stands as a monument to the fall of communism.

These natural cliffs look like they are a part of an old castle complex.

Ruins of an early Roman Christian church dating back to the 4th to 5th centuries.

"Unity, Creativity, Beauty."

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

Built in the Soviet era, this cableway system still runs gondolas from Odessa down to Otrada Beach.

Kyiv's answer to Muscle Beach is a Soviet-era gym made from scrap metal.

This underground transport hub doubles as an art gallery.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

An Art Nouveau building covered in animal gargoyles and grotesques.

This derelict superstructure was a very important warning system for the Soviet military.