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

This church was constructed on the site where St. Philip the Apostle preached to the ancient Athenians.

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

This Ottoman-era church is hidden amid a busy tourist area.

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

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

This post-Ottoman era church in Athens was built by locals to serve the residents of Anafiotica

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

An ancient Greek monument and a Byzantine church coexist inside this cave.

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

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

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

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

These caves secretly held national treasures during World War II.

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

See how paper is made the old-fashioned way.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

According to a local legend, this old castle could only be built after a woman was immured in the walls.

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.

Decorated with a staggering 1,380 ladybugs, the installation has turned what was once a grim, forgotten nickel mine into a landmark and a statement.

Here lies a legend of three sisters, all in love with the same mariner.

Former military fort and site of untold horrors during WWII, this island may become the Adriatic's next luxury resort.

A tiny church on a man-made island in the Adriatic.