The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

What happens when you cross a mayor and a painter?

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

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

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

This striking sculpture of Icarus honors Greece's fallen flyers.

A Byzantine-era church hidden in a wooded area below the Acropolis.

Where commuters walk through remnants of an ancient Greek necropolis.

Large collection from the 3rd millennium BCE.

Legend says this sacred tree was a gift from goddess Athena.

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

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

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

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

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

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

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

19th century pendulum and a clock restored by a rogue group of guerilla artists.