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

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

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

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

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

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

According to legend, this ancient column contains healing properties.

There are many Byzantine-era churches still standing in Athens, but this is the only one with a 2,500-year-old column rising through its roof.

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

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

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

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

The Greek island's old British cemetery feels like a forgotten garden.

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

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 little-known, 35,000-specimen collection in Greece is a lepidopterist's dream.

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

These caves secretly held national treasures during World War II.

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

Gladiators once walked this ancient, subterranean passage.

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

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