The smallest post office in the United States is no bigger than a broom closet.

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

A hilltop monastery on the Greek island of Hydra.

Aqua white sand highlighted with fiery red rocks.

Hiding in plane sight.

This blowhole is supposedly caused by a trapped monster.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

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

The remains of a small medieval chapel mark the legendary birthplace of the patron saint of Wales.

A holy well believed to have healing powers.

These enigmatic ruins continue to vex archaeologists.

These murals stand as reminders to the troubled history of this Northern Ireland city.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

The United Arab Emirates's biggest and oldest fort pays homage to a lost era.

This Singaporean food-court stall was home to the world's cheapest Michelin-starred meal.

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

A narrow ghost town built onto a peninsula behind a Colombian Slum.

The once-dying town of Sheffield, Tasmania has reinvented itself as a village of painted wonders.

A roundabout in the West Indies that pays tribute to a bus driver who brokered no-nonsense on the school route.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

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

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.