The first declared National Monument in the United States.

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

This once-booming Gold Rush town is now home to a herd of feral donkeys.

Petroglyphs, bird watching, and a 100-year-old Ranch in one location.

Giant steel and concrete dinosaurs near Route 66 invite passerbys into a mineral shop.

An homage to everyone's favorite prehistoric cartoon family.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

This Native American settlement dates back to the Pueblo II period.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

Legend says train robbers stashed their gold within the depths of this unusual cave.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

An urban laboratory.

The first of the iconic American roadside attractions lives on as a college mascot.

This historic national park is covered in the stunning ruins of red rock pueblos.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

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

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Multiple waterfalls and several historic CCC buildings anchor this state park in Oregon's Willamette Valley.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

The first North American landing spot for James Cook on his third voyage of discovery in the Pacific.

Two massive rock outcroppings on the Oregon coastline.

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

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