Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

The hallucinogenic center of the ancient world.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

Overlooking the harbor is a beautiful neglected mansion guarded by two Egyptian sphinxes.

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

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

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

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.

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

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

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

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

Where commuters walk through remnants of an ancient Greek necropolis.

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

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

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.

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

The abandoned summer estate of the former Greek Royal Family.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

A sprawling collection of books and manuscripts about ancient Greece that would have put their famed libraries to shame.

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

Hideout of thieves, monks, and goat-footed gods.

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