When an ancient supervolcano erupted, some of Nebraska's prehistoric animals were forever preserved in ash.

Reason for Michigan's potential diamond mine.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

The “American Gothic" artist's largest works hang in an Iowa State University library.

Dedicated to the inventor of the paint roller.

The only Frank Lloyd Wright-designed structure in the architect's hometown.

A replica of a fort built from a frontier town's mass hysteria in the face of false reports of impending Native American violence.

One of the few Cold War-era bases with many of its original structures still standing.

The honor of highest point in Michigan was almost given to the wrong peak before this mountain won out by 11 inches.

This tiny site in Iowa, part of a patchwork national wildlife refuge, is home to ancient flora and fauna.

This hand-carved wooden carousel in the Story City North Park was built in 1913.

Profile of a sleeping person four kilometers long in 250-meter-high cliffs.

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

After sitting abandoned for decades, this historic mine is now the only publicly accessible chalk room and pillar mine in North America.

Only the original archway remains from the building where a false cry of "fire" started a panic that claimed more than 70 lives on Christmas Eve in 1913.

This huge stew pot is the focal point of the "Community Soup" event, which honors tradition and soup.

This missionary's legacy looms large over the Upper Peninsula of Michigan—literally.

America's smallest town is run by its single citizen/mayor/librarian/bartender.

Large pioneer village showcasing life during boom times.

A roadside spring pooling in an old bathtub where anyone can stop and sip.

This museum is a full-size replica of an original church constructed during the 13th-century.

An eclectic assortment of medieval architecture in a small Iowa town.

Wally is the 26-foot-long fiberglass emissary for Garrison, North Dakota, one of the self-proclaimed (and hotly contested) Walleye Capitals of the World.

A series of life-sized statues of each governor of the state of South Dakota.