Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

A striking 12th-century-style castle built on the edge of a cliff.

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."

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.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

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.