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.

This canyon is named for a unique geologic formation where the river vanishes underground near the mouth of the canyon and reappears farther down.

This mining town boomed in the Atomic Age when uranium was gold, only to be abandoned when the industry collapsed.

The last SR-71 ever constructed.

A building so large that it has its own weather.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

This 28-foot-tall milk can contains one of the most whimsical ice cream parlors in town.

This sandstone mansion was the home of two of Oregon's most important pioneers.

The magic's in the hole!

Locals dubbed it the "Owl Building" because of its bird-like appearance.

At night, this glittering musical tunnel draws skaters and photographers.

The largest permanent Monopoly board makes one of the longest games even bigger.

The oldest house in the capital of Silicon Valley.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Colorado’s second largest natural lake was created by a landslide.

This distinctive snowfield on the slopes of a Colorado fourteener has several legendary origin stories.

You might want to bring a rain jacket to this travertine triple waterfall.

The walls, tables, and much of the ceiling in this pizzeria are covered with $40,000 in $1 bills.

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

Once owned by the largest employer in Colorado, these ovens have been abandoned for over a century.

The first railway tunnel to cross the Continental Divide and, at 11,523 feet, was once the highest railroad tunnel in the world.

A multicolored mineral mound dribbles piping hot spring water right off the side of a highway.