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

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

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

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

This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

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

An architect's childhood fantasy treehouse made real.

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.

The first declared National Monument in the United States.

All that remains of this once-booming mining town are the ruins of a saloon.

The site of the gruesome massacre—and maybe cannibalism—of five men, a tragedy that made Alferd Packer infamous.

This nearly abandoned town was once a thriving mining community until a series of fires.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

An enthusiastically interactive mining museum that won't let black lung ruin the fun.

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

This iconic science fiction house still looks like something from the future.