This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

Legends surround this jagged rock formation in the New Mexico desert.

Singing sand that stands as the final remains of an ancient lake.

Once a speakeasy operated by Al Capone, this Milwaukee cigar bar is now a haven for ghost hunters.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

Every winter, the wind carves blocks of frozen water into beautiful abstract shapes inside this unusually curved tunnel.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

This underwater cave in Madagascar is home to what is thought to be the country's largest fossil graveyard.

This monument remembers one of the manliest men of the frontier who fought a grizzly before dragging himself 200 miles to safety.

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

Rippling sand dunes frozen in the Arizona rock.

This quiet park's strange sedimentary spires were named after Kodak's color film.

Known as "The Hill of the Little Devils."

This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

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

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

The highest point in Wisconsin is capped by two towers that are not as mythic as Tolkien's but provide much better views.

Largest collection of mounted dinosaur specimens in the world.