Indents in the pavement are all that remain from a grisly death machine in Paris.

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

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

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

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

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

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

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

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 striking sculpture of Icarus honors Greece's fallen flyers.

Where commuters walk through remnants of an ancient Greek necropolis.

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

Large collection from the 3rd millennium BCE.

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

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

A sharp sculpture made of thousands of pieces of jagged glass.

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

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

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

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

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

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

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