The old fire tower is one of the last of its kind in the United States.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

Cross the Continental Divide through an old railroad tunnel, and ride back to the top on a shuttle.

The mayor made the declaration in 2004.

One devoted couple has donated multiple recreations of Michelangelo's sculptures to this South Dakota town.

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

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

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

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

South Dakota's oldest operating brewery is housed inside a historic firehouse.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

Every president in history is immortalized in bronze in downtown Rapid City.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

Seth Bullock, the sheriff of Deadwood, built this town immediately after Teddy Roosevelt’s death in 1919.

This vintage train once gave new meaning to “swimming upstream.”

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

The first declared National Monument in the United States.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

Some 46,000 years ago, a volcanic eruption led to a flooding event that carved this short canyon with steep vertical walls.

Dubbed the "Blade Runner dragon," this buzzing neon sign is a beloved local icon.

A breathtaking 19th-century trail overlooks Lake Tahoe.

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

The unusual patterns in this rock formation result from two distinct modes of weathering.