A castle built by an eccentric medieval enthusiast in suburban Ohio.

The largest earthwork effigy in the world.

The sculpture's largest spire points directly toward the North Star.

The largest collection of ornamental hair combs on the planet.

This whimsical stacked cabin looks like something out of a children's book.

This old residential building was once the largest flour mill in the world.

Sleepy Minneapolis block beats Guinness Record for most churches on one city block.

The watery grave of an impractical idea.

This rare vessel mixed luxury with labor before being converted to a museum and sometimes haunted maze.

Downtown Minneapolis mixed art and function by turning some of their sewer covers into works of art.

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

This iconic water tower and failed bandstand is open for panoramic views once a year.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

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

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

Home to the Amorphophallus titanum "Corpse Flower," which is among the largest flowers in the world and also smells powerfully of rotting flesh when in bloom.

Hub of Scandinavian culture in a Minneapolis deli.

This striking art museum holds an amazing series of curiosity cabinets.

The center of the only hemisphere that awards visitors with a commemorative coin.

Statue dedicated to the star of an old television show.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

Step inside Lucy, the world's largest "elephant."

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

The only surviving prototype for Buckminster Fuller's house of the future.