The final remnant of the Arkansas zinc industry is this historically protected ghost town.

A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.

The strange and snarky traditions of the lumber industry's fraternal order began with five men waiting for a train here in Arkansas.

A peaceful place in the woods where everything is a work in progress.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Shop of curiosities with a dinosaur museum tucked in its basement.

The beauty of urban decay, hiding some dark secrets.

San Diego's most historic and haunted home.

A stealthy Apache hideaway that became the haunting site of a mass grave.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

Dig for your own trilobites in this goldmine of invertebrates.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

European castle ruins in an American state park are actually the product of death and grief.

A once grand hotel is being retaken by the wilderness it once capitalized on.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

This glamorous old building is said to have inspired the Tower of Terror.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

A clear blue swimming hole with hidden caves, still unexplored.

See massive fossils that are over 200 million years old in northeastern Arizona.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

These eerie outliers of the lightning bug family glow a mysterious blue color.