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

Despite monuments in other locations, this spot in a South Dakota field is recognized by the U.S. National Geodetic Survey as the center of the 50 states.

This towering wooden Sasquatch was carved with a chainsaw.

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

This geodesic gallery holds a collection of painted spheres that make traditional canvases look lazy by comparison.

This municipal park along the Missouri River honors the galley central to the Lewis & Clark Expedition with a replica ship and sculptures.

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

A true roadside icon standing on the same plains that the herds once roamed.

The metal bird, nicknamed "Sandy," stands nearly 40 feet tall and is an homage to the birds that migrate through North Dakota every year.

The world's largest Holstein cow.

"...I guess that was your accomplice in the wood chipper?"

This ambitious attraction was the brain child of a lake resort impresario, and built by the WPA.

A chimney and a plaque are all that remains of a logging camp that once cleared out a large swath of Minnesota's old-growth forest.

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

A comedy troupe's collection of bizarre humor.

A larger-than-life version of the hat beloved by hunters, outdoorsmen, and Holden Caulfield.

The watery grave of an impractical idea.

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

As its grandiose name implies, this wooden dome is unsurpassed in size.

Talula the swan has been welcoming visitors to Elk Rapids, Michigan, for more than four decades.

Unique Michigan homes look like something out of Tolkien's "The Lord of the Rings."

There's more contention than one might expect from cherry pie pans.

Large one-man sculpture park in Michigan.

A horse-drawn 1858 steam pumper fire engine encased in glass on the front lawn of a Michigan insurance company.