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

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

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

This sky-high radio mast is formerly the tallest man-made structure in the world.

A rim-made reptile in North Dakota.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

This punny mirror of another Wisconsin attraction is exactly what it sounds like.

A curious sculpture garden and museum in Cochrane, Wisconsin.

The tragic death of 19-year-old Mabel Tainter in 1886 led to the construction of this unique Victorian-era theater in the northern woods of Wisconsin.

As the glaciers retreated out of northern Wisconsin, this unique natural wonder was crafted.

Sip whey-based vodka at the first Native-owned distillery opened on a reservation in centuries.

This posh mansion began as a family's estate and ended as the site of a murder ripped from the pages of a pulp novel.

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

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

This quirky roadside attraction provides insight into Minnesota's logging history.

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

143 feet of leaping muskie whose mouth can be used as a wedding venue.

Gambling, boozing, and yodeling animals cover the walls of this dive bar cum natural history museum.

A stone face watches over the river.

The world's largest woodcarving collection includes dozens of Bible scenes and a wooden bestiary, all carved by one man.

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

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.