Poseidon? No one seems to know.

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

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

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

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

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

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

Gladiators once walked this ancient, subterranean passage.

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

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

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

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

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

Elaborate stone houses constructed from the ruins of war.

According to legend, this ancient column contains healing properties.

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

These caves secretly held national treasures during World War II.

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

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

A historic building houses one of the most important archaeological institutes in Europe.

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

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

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

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