This massive redwood tree has a hole in the base big enough to drive through.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

'Cause the fence start shaking, the earth was quaking.

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

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

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

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

The legendary building that needed ghostly approval before being built.

The rocks in this arid basin leave trails of movement behind them.

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

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

Community bookshelf of 25-foot-tall book spines.

An abandoned castle owned and ignored by Masons carries a cursed history.

An unrealized dream to wirelessly electrify the entire Earth.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A rare view of a preserved Victorian science museum.

World's first "penitentiary," meant to be humane, drove men insane.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.