This sprawling building built in 1890 was one of Minnesota’s earliest and largest mental health facilities.

The lowest point in South Dakota and the source of the Minnesota River.

The first spinning jail built in the United States is the only one that still turns.

This vintage "streetcar boat" lay at the bottom of Lake Minnetonka until the 1980s.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

Grant Wood painted some of his most famous works of art at this studio.

One of just a few cities in the world to base their center of government on an island. Others: Paris and Osaka.

The Iowa state contender for largest pan in the world oddly only comes in second or so.

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.

This architectural stunner is one of the few surviving Egyptian Revival theaters in the U.S.

A sprawling outdoor museum filled with larger-than-life works of art.

The home where a lovestruck Fitzgerald wrote his first published novel, "This Side of Paradise."

This water tower has been a staple of the Rochester skyline since 1931.

An Art Deco gem that held together the artistic heart of an agricultural community for 92 years.

This national park dedicated to the tallgrass prairie ecosystem still displays its military past.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

The oldest house in Galena, Illinois, now is a reminder of when this city was the world's lead mining capital.

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

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

The remains of a bustling turn-of-the-century park built to showcase the wonders of electricity.

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

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

This double-arched masonry highway bridge is the only structure of its kind in Minnesota.