One of the largest, oldest, darkest, quietest motel rooms in the world.

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

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Nevada's largest cactus collection stands outside a candy mogul's small factory.

A new kind of theme park for adults off the Las Vegas Strip.

Activists are fighting to preserve these unfinished highway ramps as a tribute to the citizen revolt that halted their construction decades ago.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

A normal, unassuming pedestrian overpass has been the demise of many, many trucks.

This sculpture forces visitors to confront their relationship with space.

The longest and widest floating bridge in the world.

This 50-ton ship on Orcas Island has never seen the ocean.

A magical sanctuary of mythological statuary.

A 1940s nuclear reactor built to produce plutonium for the Manhattan Project.

The spur that wouldn’t die.

An electrifying collection of gadgets and literature from the 16th through 20th centuries.

From overly ambitious (and eventually abandoned) atomic dream to bustling office park.

A comprehensive collection of bonsai set in a beautiful campus.

The century-old remains of an abandoned farm town in eastern Washington.

This Cold War missile launch site has been abandoned for 40 years.

An allegedly haunted mansion with a tragic, tawdry past.

A whimsical menagerie of devils, krampuses, satyrs, and other horned creatures.

Site of the greatest known waterfall that ever existed.

This large Sitka spruce that appears to be floating in mid-air, has defied logic for years.