Right here, members of the Lewis and Clark expedition boiled ocean water to make salt.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

Belly up to the bar in Cowtown, don't forget to buy some boots.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

A "Texanic" (gigantic Texas) collection of Art Deco architecture at Dallas' historic Fair Park.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

This small, but beautiful waterfall has attracted visits from artists, composers, and two United States presidents.

This soaring sculpture and Sioux Falls landmark represents the leap of faith taken to make one's dreams come true.

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

A 6-mile-long lake created by an apocalyptic seismic event and the deadly chain reaction that ensued.

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

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

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

A free, canine-friendly alternative watering hole near the more famous Barton Springs.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

According to the legend, this strikingly beautiful hill has miraculous healing powers.

A city park that sits on top of a freeway.

Detailed facade of a brownstone in Boerum Hill.

All that remains of the once-booming chain is a single orange-roofed restaurant.