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.

This magnificent market stands as a poignant symbol of the suffering caused by the Spanish Civil War.

Down this yellow brick road, visitors are treated to toadstool houses and massive mushroom sculptures.

This 47-story "M" needed 20 years to be completed

Legends surround this natural rock formation that looks like a Moorish king wearing a crown.

A museum wholly devoted to juvenescence.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.