An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

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

A self-built castle made by a mysterious man.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A huge musical instrument played by the ocean.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

The Virginia home of one of the signers of the Declaration of Independence is being preserved with a unique glass facade.

The United States' oldest Episcopal church still in active use.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

A black cottonwood gets a second life as a home for books.

Remnants of a storybook amusement park hidden behind a strip mall.

The trials and tribulations of marking Poe's grave.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

After hundreds of years of settlement, this once-bustling fishing village sunk into the Chesapeake Bay.

The land is home to swimming ponies and a legendary 18th-century treasure.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.