Most of this “research national monument” still lies buried beneath the earth.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

This Moab institution functions as both a rock store and a small natural history museum.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

This balancing rock is one of Utah's most unusual geological formations.

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

This magnificent natural sandstone bridge is one of the largest in the world and is an iconic symbol for Lake Powell.

A museum has some wedding cake dating to the Teddy Roosevelt administration, and some bacon from FDR's.

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.

A tunnel with windows, so you don't miss out on the impressive views.

The unusual patterns in this rock formation result from two distinct modes of weathering.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

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

The first declared National Monument in the United States.

A devilishly named gorge that was a sign of salvation for many pioneers.

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

Named for a prominent scout and explorer, this Wyoming state park encompasses a replica of an 1840s trading post, a 19th-century Army outpost, and early 20th-century automobile lodgings.

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.

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

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

A memorial to the most decisive Native American victory of the Plains Indian War.

The only road through the heart of Glacier National Park.