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

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

Take a glimpse into a pioneer-era homestead at the birthplace and home of Indiana's "Children's Poet."

The world's largest collection of the world's largest objects is in one small Illinois town.

Buy a token from the liquor store and you can make this beast spew flames on command.

Named for a prominent scout and explorer, this Wyoming state park encompasses a replica of an 1840s trading post, a 19th-century Army outpost, and early 20th-century automobile lodgings.

This geothermal hot spring hides beneath a slowly growing mineral dome.

This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.

This Moab institution functions as both a rock store and a small natural history museum.

This otherworldly church spire reaches up toward the heavens.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

This early pioneer landmark is one of the oldest buildings in this part of Kansas and one of the few Dutch mills ever built in the state.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

A version of this picturesque mill has existed since the 1800s.

The seventh largest spring in the world.

An ode to "The Queen of Appalachia."