The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

A small Wyoming town is home to the state's oldest-operating soda fountain.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

Population: 1.

A small town built on an abandoned airfield has former runways as streets and a bar and grill in an old airplane hangar.

Native Americans built this circle of stones, which was used to predict astronomical events.

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

The crumbling structure is a rare surviving relic of the area's bygone mining industry.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

These giant metal horses graze on a hilltop near the Montana highway.

An entire town preserved as a historic landmark.

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

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

Despite repeated attempts to make it work, this former mining town is now nothing but dust and memories.

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

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

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

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

A working ranch doubles as a sustainable hub for world-renowned classical music and large-scale sculptures.

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

The oldest badlands in North America, Makoshika State Park takes it name from the Lakota words for broken land.

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