A vertically floating hemlock controls the waves and weather at Crater Lake.

The spot where the namesake of the Douglas fir met his mysterious end on a Hawaiian volcano.

This black shoreline is made up of exploded lava particles.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

A world-class observatory in the California desert.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

Museum about life, death, and cannibalism in the Stone Age.

An intricately decorated tiny place of worship.

Underground hospital complex constructed by slave laborers during the German occupation of the Channel Islands.

The first island in the world designated a light-pollution-free astronomical observation point.

The world's second largest single-dish radio telescope, once used to contact E.T.

Commercial airplanes land mere feet over the heads of sunbathing beachgoers on this tiny island.

This underground oasis is one of North America’s most fascinating prehistoric places—and you can scuba dive in it.

A passage grave used in neolithic rituals.

This natural crater along the coast of Jersey may take its name from the devil statues who have watched over it.

Folklore and history carved into Brittany's coast.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

France's most famous cemetery, with some of its most curious tombs.

Notorious artist squat renovated into legal studios.

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