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

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

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

Pilgrimage site for star-crossed lovers.

Go inside to really appreciate this 500-year-old technological masterpiece.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

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

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.

Large collection from the 3rd millennium BCE.

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

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

This striking sculpture of Icarus honors Greece's fallen flyers.

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

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

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.

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