A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

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

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

An exquisite Baroque church in Vienna's old town.

The solemn exterior conceals an opulent interior of this 17th century church.

Op-art architecture designed for happiness.

Baroque celebration of the end of the Great Plague of Vienna.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

Bangkok celebrated its shifting monarchy with a militaristic homage to democracy.

A shrine built to combat the bad karma of a commercial venture.

For centuries young Thai men used this Giant Swing as a slingshot to heaven.

On stormy days debris from this unfinished and abandoned skyscraper rains down on the Bangkok streets.

A condom-covered Thai restaurant that is more concerned with birth control than food.