This was the first ever National Lakeshore, established in 1966.

These dramatic cola-colored falls have appeared in a poem by Henry Wadsworth Longfellow and a song by Sufjan Stevens.

The honor of highest point in Michigan was almost given to the wrong peak before this mountain won out by 11 inches.

A strenuous, unofficial trail leads to spectacular views in one of America's most remote national monuments.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

Limestone caves with spectacular showcase chambers.

Ancient pueblos built into the base of a natural canyon wall.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

An unusual geological feature towers over the remains of a dark episode in United States history.

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

The first declared National Monument in the United States.

Most of this “research national monument” still lies buried beneath the earth.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

The largest source of fossilized insects anywhere.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

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

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.

These cliff and rock formations are made out of Sioux Quartzite.