When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

Archaeologists believe this panel of petroglyphs depicting descending sheep and other figures in Glen Canyon are 3,000 to 6,000 years old.

A sharp bend in a dramatic river canyon cut through red rocks.

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.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

A mining camp built around an unexpected occurrence of silver.

A kitschy stop on the way to Zion National Park.

Walk through the sets of old western films at this small museum in Utah.

A vibrant arts enclave in stunning red rock scenery.

Although it also features red, orange, and variegated cliffs of Navajo Sandstone, this state park is often overshadowed by its more famous neighbor.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

Bridges, terraces, and replicas of historic structures all built of rock and petrified wood by one man.

The longest continuous lava tube in Oregon.

Atop an active stratovolcano, two lakes separated by a narrow strip of land.

A sprawling cave network created by a lone lava tube.

The original span of a high bridge across the deep Crooked River Gorge has been preserved for pedestrian use.

Spectacular volcanic cliffs along the Crooked River invite hiking, rock climbing, and photography.

Canyon walls shrouded in ferns.

This 19th-century museum inside of a lighthouse is only accessible during low tide.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

These cinderblock farmhouses were actually World War II radar stations in disguise.

Hopeless romantics will swoon over the sweet story behind this bright and colorful home.