A "haunted" landmark on the coast of Southern California.

The homestead of American patriot John Adams.

More than 21,000 images fill this overlooked gem of a prehistoric site.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

The largest man-made crater in the U.S. marks the spot where we once tested mining with nukes.

This nature center has one of the largest collections of native raptors in the Pacific Northwest.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

Other-worldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

The overgrown ruins of a once thriving World War I-era copper mine.

1920's mining camp and environmental education center is serving to protect the surrounding forest, one of the last of its kind in the Pacific Northwest.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

Singing sand that stands as the final remains of an ancient lake.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

The huge collection of paintings of the American West is one of Denver's best-kept secrets.

Home to the Titanic Historical Society's collection.

A collection of massive stacked rocks in Texas includes a snarky note on the benefits of modern technology.

This dilapidated ship carcass covered in trees is a striking sight.

Former utopian colony based on the belief that the universe exists in a hollow sphere.

Steep canyon walls hide a forested oasis in the West Texas desert.

A century-old cabin off of Highway 30 touts an unusual construction material: dinosaur bones.