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

This massive swimming pool is the high tech home to the human-powered submarine races.

A shrine contains nearly 200 statues of the Buddhist deity Jizo, dressed in bibs by parents who have lost a child.

1,001 carved statues of the Buddhist God of Mercy, each with a unique face.

The 10,000 Torii shrine.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

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

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

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

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

The world's largest frame offers spectacular views of the city's past and present.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

A building shaped like the Army Corps of Engineers logo, because why not?

Washington's iconic carousel has a nice piece of Civil Rights history.

Garments from across the globe call this hidden gem home.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.