Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

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

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

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

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

Lucerne's central prison was converted into a tourist hotel with a bare minimum of changes.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Rome’s legendary peephole vista is also a former Crusader stronghold.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Sofia's legislative center is continuously reinventing itself.

This building has two facades of clashing architectural designs.

A striking symbol of the Bulgarian capital.

A flamboyant five-story building in Bulgaria resembles a crawling snail.

Romania's triumphal arch looks out over Bucharest.

Locals believe this abandoned ruin on the outskirts of Bucharest is haunted.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

The largest cactus farm in Africa.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

These bamboo and rope bridges cross the Nam Khan River for six months every year.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.