An architect's childhood fantasy treehouse made real.

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.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

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

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

Visit a church sculpted from hardened lava.

The world's largest Holstein cow.

The metal bird, nicknamed "Sandy," stands nearly 40 feet tall and is an homage to the birds that migrate through North Dakota every year.

A true roadside icon standing on the same plains that the herds once roamed.

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

The statue honors the booming birds Rothsay, Minnesota, is famous for.

The world's largest otter started his life as a high school shop project.

The childhood home of America’s first winner of the Nobel Prize in Literature.

The city of Rockford, Illinois is symbolically protected by a quartet of fittingly stony sentinels.

An amazing collection of sculptures and art.

See where Bill Murray kidnapped a hapless Punxsutawney Phil.

Faces carved into the cliffs create an otherworldly walking trail.

The last example of an innovative piece of surveying equipment now stands in its inventor's hometown.

It's a unique monument honoring a great character who inspired a generation of young women to be more and pursue their dreams.

Constructed from the ruins of a former glass factory, this park incorporates the old with the new.

Nature and art meet in this curvy creation

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

Bison, America's national mammal, are staging a slow comeback in Ohio's prairie parkland.