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

Preserved portions of Athens's ancient defenses are on display in a subterranean parking garage.

Gladiators once walked this ancient, subterranean passage.

Where commuters walk through remnants of an ancient Greek necropolis.

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

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

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.

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

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

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

The best-preserved Roman small town in North Africa.

An ancient burial ground believed to have been used for ritual sacrifice.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

Founded in 670, this ancient mosque is an architectural time portal.

This museum in the famously blue neighborhood of Sidi Bou Saïd showcases a traditional Tunisian lifestyle.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

A 15th-century granary that played the role of futuristic slave quarters in the world of 'Star Wars.'

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

A massive, abstract lookout tower providing a panoramic view of Prague.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

This spooky statue sits outside a famous Prague theater.