These four islands right offshore have waterfalls, colorful lights, fancy buildings, and a secret purpose.

A castle built for love, and abandoned due to heartbreak.

This record-setting hydraulic dam in the Montana badlands was one of FDR's most ambitious public works.

New fungal and bacterial species call this deadly lake home.

An entire town preserved as a historic landmark.

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.

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

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

See the computer’s history revealed over the course of 20,000 years.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

Mennes invented the tags we all place annually upon our license plates, and his story is told frankly and in full upon his headstone.

This sky-high radio mast is formerly the tallest man-made structure in the world.

"...I guess that was your accomplice in the wood chipper?"

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

Medical history museum featuring a lovely doctor's office from the 1800s.