A stoic rock cairn is all that remains to remember one of the more brutal instances of frontier treachery in American history.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

When ecosystems collide in the arid Southwest.

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

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The first declared National Monument in the United States.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

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

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

The world's largest private aircraft collection.

The unique collection includes bronze cast handprints of some of America's most famous astronauts.

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

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

Its unique collection details the history of the state's svelte railroads.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

The maritime museum that boasts the largest nautical library in the western hemisphere.