Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

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

The longest continuous lava tube in Oregon.

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

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

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The world's longest known cave system.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

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

The oldest continuously occupied public building in the United States.

A natural formation that resembles a camel resting in the New Mexico desert.

This highest peak in New Mexico is named after an explorer who had a habit of lending his monicker to peaks.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

Deadly airliner crash preserved for those willing to climb and pay respects.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

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.

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

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.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

A mythical bird etched into the face of a rock doubles as the mascot for a nearby school.

A Japanese temple, old German townhouses, and public chess tables offer a peaceful escape from the bustle of the North Side.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.