Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

An homage to everyone's favorite prehistoric cartoon family.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Legends surround this jagged rock formation in the New Mexico desert.

The first declared National Monument in the United States.

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

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

This replica small town lets visitors take a stroll through the story of progress in the U.S. via thousands of Americana artifacts.

American bison herd descending directly from a Bronx Zoo breeding program that saved the species from extinction.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

One believer transformed a local curiosity into proof of Vikings on the Great Plains.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

The world's largest fully steerable radio telescope.

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

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

The highest bridge in America was built for an almost unnervingly small amount of money.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The largest source of fossilized insects anywhere.

Wisconsin's most celebrated export gets the royal treatment on I-94.

The famous author's birthplace is preserved in a town that he once described as narrow-minded.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.