America's first National Historic Landmark is a 100-foot tall obelisk and gravesite dedicated to the only casualty of the Lewis & Clark Expedition.

A unique work of outsider art sourced from scrap metals and signifies conservation.

The last location where Buddy Holly, Ritchie Valens, and J. P. "The Big Bopper" Richardson played before their tragic deaths.

A museum showcasing the life of "Buffalo Bill"

An underground wonderland in Iowa.

A wonderland of caves in eastern Iowa.

The farm toy capital of the world hosts a museum filled with toy tractors dating back to the late 1800s.

One of the largest private collections of fossils in the world.

This remote island in Iowa was abandoned after being devastated by flood.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

In rural Iowa, an imported 19th-century windmill overlooks an unlikely enclave of Danish culture.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

Lone survivor from Custer's Last Stand forever preserved.

See the motorcycles that launched the stuntman to fame and the gear that saved his life.

Once seen as a bit of an eyesore, this sculpture has become a staple of downtown Houston.

The largest underground pedestrian tunnel system in the U.S. mostly caters to the people working in the offices above, but provides a great, air-conditioned way to traverse the city.

A tiny town’s tiny museum with some gigantic residents.

See 150 million-year-old dinosaur tracks and bones dating back to the Jurassic period.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

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

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

This small museum is home to some of the oldest and best-preserved dinosaur specimens found in Montana.

A sprawling museum located on the former site of the Orphan Girl Mine.

One of the last socialist halls still standing in the United States.