Tirelessly maintained by a Wisconsin man named JFK.

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.

A fictional Coupe DeVille built by hand and gifted to the Man in Black himself.

Terraced flowerbeds and rock sculptures in the midst of the Minnesota wilderness.

A haunting army of decomposing, moss-covered stuffed animals and dolls guard this swinging truss.

A 70-foot replica of the famed Eiffel Tower.

Hiding behind a grocery store is a spectacular cavern carved as part of an old limestone quarry.

Crumbling Kennedys and a decaying Tecumseh are just some of the haunting remains of one man's cement art trail.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Once a year, at exactly 11:11 a.m., this monument comes to life.

A sculpture of a giant man escaping from the depths of the Earth.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

This lagomorph-obsessed Route 66 emporium is home to a giant jackrabbit that sits in a bunny graveyard.

Oversized statues are just the tip of this nostalgic Americana roadside attraction.

A mythical bird etched into the face of a rock doubles as the mascot for a nearby school.

During the 19th-century, this park was a vital trading fort.

This life-size bronze statue remembers the tallest recorded human in his Illinois hometown.