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.

An architect's childhood fantasy treehouse made real.

The largest self-built castle in the U.S., six decades in the making.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

The highest bridge in America was built for an almost unnervingly small amount of money.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

Strange red rock formations that have been attributed to a higher power for hundreds of years.