Jurassic Park—A Still Life.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Come for the speed, leave in love with the desert.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

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

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

This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

Native Americans built this circle of stones, which was used to predict astronomical events.

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 rancher expanding a natural spring for his cattle came up with bones – lots and lots of them.

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

An experimental, automotive replica of Stonehenge.

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

These giant metal horses graze on a hilltop near the Montana highway.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

An entire town preserved as a historic landmark.

This amazingly preserved Gold Rush town is a historian's dream.

The mayor made the declaration in 2004.

A wild west land agreement was etched right onto this historic Idaho stone.

A glimpse into the "Logging Capital of the World" at a time when there was far more forest and far less machinery.

This playground sculpture of an icon from the past is dedicated to the children of the future.