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

This unassuming riverbank is Missouri’s first designated site in the National Underground Railroad Network to Freedom.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

Two geoglyphs that are truly unique to North America.

The first steel dam in the world and the only one still functional in the United States.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This bird-shaped rock formation defies gravity, time, and classification.

A 2,500-pound wooden nickel makes this woodworking museum easy to spot from the road.

The Grand Canyon of Texas.

The top of a giant mesa, just outside of Amarillo, appears to float in the sky above.

Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

This former Union fort commands a fine view of downtown Cape Girardeau and the Mississippi River.

Nestled in Onondaga State Park, over 100 canoes carefully stacked in a replica of the famous standing stones.

This museum located in the "Corn Cob Pipe Capital of the World," chronicles the history of cob pipe.

Journey up the capitol building's cupola for an amazing view of Topeka.

Kentucky's anomalous peninsula projecting into the Mississippi River, site of legendary earthquakes and local feuds.

A chapel built by Italian POWs during World War II tells a forgotten tale of the war on the home front.

Ornate limestone building now filled with geologic specimens, and more.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

The remains of this visionary community can still be found much as it was a century ago.

The largest historic preservation organization in the United States.