A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Civil War soldiers, captains of industry, and paupers all interred on historic grounds.

"We Seceded Where Others Failed."

A historic presidential getaway on the continental United States' southernmost island.

A monument celebrating the idea of reaching inaccessible places.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A tribute to Ponce de Leon's supposed quest for eternal youth.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

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

A beautiful geyser under environmental threat.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

America's only nuclear missile silo open to the public.

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

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

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

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

When ecosystems collide in the arid Southwest.

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

The largest source of fossilized insects anywhere.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.