America's only nuclear missile silo open to the public.

148 feet long and in the middle of a verdant forest.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

The only diamond mine in the world where you can keep what you find.

San Diego's most historic and haunted home.

A multi-storied adobe complex has been inhabited for more than a thousand years.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.

A Saint Nicholas-themed ghost town in the Mojave desert.

Dig for your own trilobites in this goldmine of invertebrates.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

More than five miles of underground passageways.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

Arrr! The most authentic collection of pirate artifacts in the world... matey.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

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

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

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

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

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