There was a top secret plan during World War II to seal a group of soldiers inside the rock.

The forest that inspired Winnie-the-Pooh's Hundred Acre Wood can be found outside London.

The abandoned mine where American troops discovered a treasure trove of art and artifacts hidden by the Nazis.

A perilous medieval road leading right into the sea.

Eulogizing an unknown man's unusual demise.

A fifth-century temple improbably built into the side of a cliff.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

A sinkhole and now a swimming hole, too, full of dazzling turquoise water.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

The smallest restaurant in the world.

The 44,000-ton aircraft carrier was purposely sunk to create an artificial reef teeming with life.

Climb atop one of the world's longest and heaviest trains for an unbelievable journey across the Sahara Desert.

A memorial to the murdered Jews of Kaunas.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The first skyscraper to include a Ferris wheel built into the facade.

Constructed from recycled wrought iron railroad tracks, it's been described as the most beautiful seaside pier in England.

The 40-year-old machine serves soda quicker than you can catch it for a mere 75 cents a pop.

This beautiful example of Victorian engineering is the oldest water-balanced funicular anywhere in the world.

Nature’s skyscraper launches out of the terrain with attitude.

These strange piles of magnetized volcanic ash travel across the desert about 50 feet per year.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.