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

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

Where commuters walk through remnants of an ancient Greek necropolis.

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.

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.

This unique building in the main square stands out among the city's typically Baroque architecture.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

Dynastic Home of the De Piro Family.

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

This lurid German fountain plots the sad course of marriage from dating to death.

Built by the Portuguese colonists in the early 16th century, this fort is one of the oldest European structure in Asia.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A fake medieval village in the middle of Turin.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.