The ruined doorway is a portal to the building's turbulent and torturous past.

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

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

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

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

These caves secretly held national treasures during World War II.

A former military hospital is now used to study and preserve artifacts of the Acropolis.

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

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

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

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

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

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

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

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

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

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

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

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

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.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

Built by the Ancient Greeks, this chariot bridge is still in use today.

The secular incarnation of a religious meditation.