A memorial for an outsider theorist who believed that the planet is actually hollow.

The final resting place of the most famous sharpshooter.

This lovely university observatory continues to sit abandoned since its potential savior was sent to jail for fraud.

The largest earthwork effigy in the world.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

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

Half of a waterfall goes into the river while the other half seems to disappear.

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

A jaw-dropping brutalist space church seems to have crash-landed in the middle of America.

After four years of grasshopper plagues, this chapel was erected as a plea to God to make them end.

A Norwegian church that was built before Wisconsin was even a state has been entirely moved to a nicer spot.

A futuristic climate change study is nestled deep within this public land.

The oldest continually used church in Minneapolis also sells great meat pies.

Five acres of divinely inspired folk art.

This cave holds a surprisingly colorful variety of geological oddities.

Vikings and Evangelicals have both had a hand in this replica medieval church.

A bizarre house filled with an astounding array of collections.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

Known locally as "the giant head," this 14-foot LED sculpture has a photo booth in the neck where you can have a 3D picture taken and displayed.

One of the largest collections of holy relics in the country.

At the center of this cemetery stands a 2,000-year-old burial mound of the Adena culture.

Ohio's 19th-century communist micro-society.

Acres of English cottage gardens, unexpectedly nestled in a Cleveland suburb.

A gregarious Ohio resident has been building his whimsical temple to peace for decades.