A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

Mark Twain once stopped at this rest station during his journey to Nevada.

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

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

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

Surrounded by a hundred mile radius of billboards, Little America is a roadside attraction whose primary appeal is hospitality.

A popular rock that acted as a waymarker for American pioneers.

Miraculous tree that seems to sprout out of solid rock.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

This UFO landing strip was created by a charitable Wyoming city that was worried about residents of Jupiter.

One of the smallest towns in the United States.

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 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.

A beautiful geyser under environmental threat.

A museum of natural history, Edwin Carter's original log cabin home and workshop houses taxidermy specimens.

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.

Metal water storage tank turned ethereal concert hall.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

When ecosystems collide in the arid Southwest.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.