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.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The first declared National Monument in the United States.

Quite simply the largest tree in the world (by volume).

A 19th-century cabin built into a hollowed-out Sequoia tree.

The second-largest giant sequoia in the world.

Canyon walls shrouded in ferns.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

A giant open-air sculpture made of over 200 full-sized boats.

This Stonehenge-inspired solar calendar stands alongside a landfill, in the middle of the Nevada desert.

Narrow slot canyons in a badland eroded into soft sedimentary rock provide an otherworldly landscape in this remote Nevada state park.

The longest living non-clonal organisms on Earth.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

This crumbling stump is all that remains of what was once thought to be the oldest living organism.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

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

Eat like a "buckaroo" at this remote restaurant.

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

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

A vertically floating hemlock controls the waves and weather at Crater Lake.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

The world's last remaining store of its kind.

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