This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

Beer lover's can-covered house.

The Real LegoLand.

A museum dedicated to the exploring past, present, and future innovations.

One man's quest to save his town with a trail of record-breaking sculptures.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

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.

An experimental, automotive replica of Stonehenge.

An oddly poignant roadside attraction celebrating American folklore.

A Foundry on a Sleepy Street.

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

An architecturally-focused antique shop.

An old soap company building now houses one of Minneapolis’s oldest independent non-profit art galleries.

When flour explodes, it's not a pretty sight.

The only arched bridge made of stone on the entire Mississippi River.

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

A museum within a museum, devoted to history's most questionable medical devices.

World's largest carved onyx figure stands as a tribute to enduring peace.

A curious sculpture garden and museum in Cochrane, Wisconsin.

Homemade outdoor church and sculpture garden decorated with glass shards.

A large circus museum with summer performances.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.