A study of Fascist era Art Deco design in Italy.

An interactive museum-like experience takes visitors back to 1980s Communist Bulgaria.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

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

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Every May, townspeople welcome summer with a bizarre pagan parade led by a man wrapped in garlands.

A collection of art from Bulgaria's time as a communist state.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Abandoned waterpark turned counter-culture mecca.

Grotto replete with mystical designs laid out in glued shell mosaics.

Thousands of well-dressed mummies below a monastery.

This abandoned shopping arcade has new life as an art installation.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

The unexpectedly beloved remnants of a controversial thermal power plant.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

An important example of architectural history slowly decays in the city center.

The hallucinogenic center of the ancient world.

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

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Where commuters walk through remnants of an ancient Greek necropolis.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

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

A sharp sculpture made of thousands of pieces of jagged glass.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.