This Ottoman-era Greek Orthodox Church was built to honor Agia Pareskevi, a Christian saint.

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

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

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

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

The home of Greece’s national poet sits crumbling in the middle of a popular tourist district.

This building displays the scars of the “Dekemvriana,” a dark time in modern Greek history.

The only ancient site that remains on the south bank of the sacred Ilissos river.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

The ruins of an ancient fortification wall sit in front of and underneath this boutique hotel.

The ruins of an ancient mansion sits in front of and underneath a contemporary art gallery.

When construction began on this hotel, developers were surprised to find the ruins of an ancient civilization.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

According to legend, this ancient column contains healing properties.

Underneath one of the region's most historic roads lies the home of Plato's successor.

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

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.

These caves secretly held national treasures during World War II.

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

A unique housing complex born from the aftermath of the Greek Civil War.

Elaborate stone houses constructed from the ruins of war.

This graffitied 19th-century building was a prototype of European industrial architecture.

The ruins of this ancient fortification wall sit in the middle of a quiet, residential intersection.