River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

Community bookshelf of 25-foot-tall book spines.

When ecosystems collide in the arid Southwest.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Most-visited and most-photographed slot canyon in the American Southwest.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

Dramatic river bend surrounds a natural red-rocked pedestal.

The largest island on the great salt lake is home to curious creatures and strange stories.

A beautiful geyser under environmental threat.

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

An architect's childhood fantasy treehouse made real.

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

One man's ambition created this psychedelic log home.

The first declared National Monument in the United States.

Just a man taking his prehistoric pet for a stroll.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

A statue honoring 44 continuous years of greeting passing ships.

This bare tree might not have leaves but it is constantly clothed in festive decorations left by mysterious local benefactors.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

A maritime museum holding the remains of Blackbeard's pirate ship.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

So many migrating birds roost on the bridge, it has a special summer speed limit.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.