Monasteries on rock pillars, once accessible only by frayed ropes.

Public water fountains built during the Ottoman Era still stand throughout this seaside town.

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

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

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

An ancient Greek monument and a Byzantine church coexist inside this cave.

A former military hospital is now used to study and preserve artifacts of the Acropolis.

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.

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

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

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

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

These caves secretly held national treasures during World War II.

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

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.

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

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

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

This multi-level, aqueduct-footbridge hybrid is one of the greatest works of the Spanish Renaissance.

Two large eyes painted anonymously on a mountain overlooking the city pay homage to an old legend.

Cliffside houses provide a spectacular view from their perch above the valley.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.