The former home of Samuel Clemens and family remembers the happiest period of the author's life.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

A research lab and hands-on museum where visitors can experiment with retro technology.

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

The final resting place of a 19th-century gold prospector and convicted cannibal.

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

The clock that sets them all.

Abandoned silver mine strewn with wrecked and twisted structures.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

A black and white painted wall creates an optical illusion in the California desert.

An invitation-only museum of items natural and bizarre, arcane and exotic.

A pair of disused Los Angeles electrical poles now glow with delicate windows into the past.

A statue commemorating the heroic life of a Viking postman who was the Godfather of California skiing.

Hidden in a hotel parking lot is a strange historical plaque erected by an obscure fraternal society.

The first attack on the continental U.S. during WWII occurred off the coast of a quiet California golf course.

This municipal playground was co-created by the father of one of the most playful characters ever.

A lighthouse built to save lives that took quite a few with its treacherous location.