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

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

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

This once architecturally advanced housing complex is now a haven for squatters that still bears the scars of war.

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

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

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

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

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

Preserved portions of Athens's ancient defenses are on display in a subterranean parking garage.

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

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.

This small chapel holds the mummified heart of one of the heroes of the Greek Revolution.

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

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

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

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

Scars of this building's past life as a violent prison still cover its walls.

These caves secretly held national treasures during World War II.

The site where hundreds of Greeks were tortured by the Nazi secret police is now a cosmetics store.

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

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

Gladiators once walked this ancient, subterranean passage.