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.

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.

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

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

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

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

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

An ancient octagonal weather station named for the eight Greek gods of wind.

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

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

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

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

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

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

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 striking sculpture of Icarus honors Greece's fallen flyers.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

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

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

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

Where commuters walk through remnants of an ancient Greek necropolis.

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