The first declared National Monument in the United States.

A museum, walk-through diorama, and library nestled under one castle-like roof.

A ghost town now swarming with dozens of prairie dogs.

A relic of roadside lore and perhaps the first of its kind in North America.

The empty town of Scenic, South Dakota, is owned by a church in the Philippines.

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

Just a man taking his prehistoric pet for a stroll.

The deserted railroad town had a last gasp as a ghost town attraction before being abandoned for good.

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

A fitting attraction for the corn capital of the world.

One dedicated priest constructed this beautiful stone grotto by hand from 1926-1933.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

This Wild West attraction is alive with glitching automatons.

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

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.

This soaring sculpture and Sioux Falls landmark represents the leap of faith taken to make one's dreams come true.

This 'terrible lizard' was one of the world's first animatronic dinosaurs.

This collection of shrines features large statues of Jesus and Mary, plus views of Sioux City.

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

This massive railroad spike celebrates the 1939 premiere of the movie “Union Pacific.”

An obelisk commemorating Lincoln's role in connecting the coasts.

Among the cornfields stands a giant spider crafted from an old Volkswagen.

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

A delightful Hans Christian Andersen fairy tale experience, not far off the interstate.