See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Three hundred years of preserved Spanish colonial history in San Antonio.

A 131-year-old wunderkammer of Texas history.

Originally a brothel during the Klondike Gold Rush, this bar once used dolls to denote when ladies were working.

A tiny wilderness cemetery commemorates the deadliest episode of the Klondike Gold Rush.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

A historic freight system that found the true gold rush is in tourism.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

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

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

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

A cemetery housing wild west legends in South Dakota.

A fitting attraction for the corn capital of the world.

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

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

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

This long unused shot tower on the Mississippi remains a point of pride for a small city in Iowa.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.