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

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A hand-built folk art installation covered with messages of God's love.

Ancient pueblos built into the base of a natural canyon wall.

The first declared National Monument in the United States.

See massive fossils that are over 200 million years old in northeastern Arizona.

Shoreline strewn with the remains of ghostly fallen trees.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

One of Chile's most active volcanoes is riddled with beautiful caves.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The only road through the heart of Glacier National Park.

The largest source of fossilized insects anywhere.

There are eight natural springs around town, each with a slightly different taste.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

On the Oregon coast there is a natural hole that seems to be draining the sea.

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

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

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

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

The rocks in this arid basin leave trails of movement behind them.

Singing sand that stands as the final remains of an ancient lake.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.