An architect's childhood fantasy treehouse made real.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

A beautiful geyser under environmental threat.

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

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

A museum dedicated to the mysterious cryptid.

This hot dog-shaped diner has moved all around Colorado, but has never been to New York.

Take a dip in the world's largest mineral hot springs pool.

Fill up your senses in this beautiful riverside garden, dedicated to the works of singer-songwriter John Denver.

This nearly abandoned town was once a thriving mining community until a series of fires.

For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

The fifth-longest natural arch in the world, and the longest outside China.

This Moab institution functions as both a rock store and a small natural history museum.

Crisp mountain water cascades over volcanic rocks at these secluded falls outside Pagosa Springs.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Right here, members of the Lewis and Clark expedition boiled ocean water to make salt.

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

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

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

This super-sized skillet is a replica of a usable giant pan where a woman once skated on bacon.

A Roman-style column in Oregon hides a spiral staircase inside.