Home to the deepest rift anywhere on Earth.

A massive sea stack famous for its appearance in The Goonies.

Only known mainland rookery of the threatened Stellar sea lion.

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

Treehouse motel and treehouse-building school.

This massive redwood tree has a hole in the base big enough to drive through.

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

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

This charmingly homemade amusement park has been growing for 40 years.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

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

The magic's in the hole!

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

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

This frequently-photographed waterfall takes only a short hike to visit.

A beautiful geyser under environmental threat.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

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

A chance to sleep among the firs and pines of the Oregon forest.

This natural marble cave is one of only five national monuments in Oregon.

A public fountain that spouts "health water" from a nearby spring.

Shakespeare has been brought to life in this open air theater for the better part of a century.

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.