The remains of a World War II munitions factory still haunt the fields of this Twin Cities suburb.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

This massive roadside mascot was the first version of the giant to illustrate his butt.

Enter the Forest of the Elves.

When waves crash onto this section of beach, the rocks sing a song.

An architecturally-focused antique shop.

20,000 pieces in a Frank Gehry-designed building.

These curious caverns have been home to mushrooms, gangsters, and disco.

This large midwestern cavern features impressive rock formations and an underground waterfall.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

The magazine keeps a perfectly groomed display garden for its photo shoots.

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

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

Steel remnants of a bridge make up a unique sculpture along the banks of the Illinois River.

The remnants of Peoria's proud baseball past stand slightly abandoned, but not forgotten.

Lined with plaques and tributes to veterans, this patriotic street was founded by Mexican immigrants.

This unassuming city park is home to three different types of Native American mounds.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

In a grove of fast growing walnut trees outside Paris, Illinois, a marker shares the story of a fictional road building culture.

The world's third-largest scale model of the planets.

Man-made geyser that rises to the exact height of the Gateway Arch.

A curious collection of miniatures in a quiet corner of the Chicago Children's Museum.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.