Qatar's oldest market can trace its origins back more than a century.

This fountain pays homage to Qatar's history of pearling, the primary industry before oil.

The building is a gigantic piece of art inspired by the shape of a desert rose.

This 23-foot-tall bear stands amid the hustle and bustle of Hamad International Airport.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

Housing the groundbreaking maps and globes of Gerard Mercator.

Six turbines towering over a wide road for passersby.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

Christ's blood allegedly preserved in a Belgian town.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This memorial museum chronicles the apocalyptic destruction of the First World War.

A moving memorial to the fallen and missing from WWI trenches.

In the shadow of a former battleground, the resting place for nearly 2,000 soldiers who died in World War I.

A 19th-century fortress and collection of artifacts offer a tour of Saudi history.

This mesmerizing, colorful structure looks like a tent made from stained glass.

An archaeological site believed to be the burial place of the "mother of us all."

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.