A white oak with property rights.

This kitschy tavern is also home to rare early editions of "Treasure Island."

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

Bad farming practices caused this unnatural natural wonder.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

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

This town is home to the world’s largest arch constructed entirely of elk antlers.

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

A beautiful geyser under environmental threat.

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

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

One of the largest collections of wildlife art in the United States, built into the side of a cliff in rural Wyoming.

Every president in history is immortalized in bronze in downtown Rapid City.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A relic of roadside lore and perhaps the first of its kind in North America.

The deserted railroad town had a last gasp as a ghost town attraction before being abandoned for good.

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

A fitting attraction for the corn capital of the world.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

A bizarre roadside attraction and the first instance of miniature golf in the world.