This dry lake bed contains the oldest known petroglyphs in North America.

Bits and pieces from the ill-fated Donner Party's winter cabins.

Step back in time while shopping inside this local store.

These modest Midwestern formations are kin to Niagara Falls' impressive cliffs, more than 600 miles away.

This erect, phallic geological spire wasn't always named so domestically.

A classic mystery spot complete with spots that are said to make you shrink or grow when you stand on them.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

Dig for your own trilobites in this goldmine of invertebrates.

One of the most remote spots in America and the first protected wilderness area in Nevada, named after an old legend.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

Journey through the largest remaining peat bogs in the contiguous United States to see the wilderness as it once was.

17,400 lbs., 12 feet in diameter, and 29 years in the making.

Tirelessly maintained by a Wisconsin man named JFK.

This cave holds a surprisingly colorful variety of geological oddities.

The longest non-mortared wall in the country is one man's tribute to his displaced Yuchi ancestor's five-year journey to her homeland.

Community owned and operated, this property is home to a diverse set of nudists.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.