The world's longest known cave system.

One of the few surviving "Wigwam"-themed motels.

Prehistoric animals decorate this popular outdoor park.

One of the last Depression-era bandshells still standing was the site of Elvis Presley’s first live concert.

Bronze statue marks the spinach capital of the world.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

Community bookshelf of 25-foot-tall book spines.

These massive mitts are made of 30 tons of devotional bronze.

Standing at 21-feet tall, this space cowboy adds to the legacy of Route 66's muffler men.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

Nature's biggest mammal swims in landlocked Oklahoma.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

This baseball diamond was home to the Rockford Peaches, a team featured in the hit film "A League of Their Own."

Wisconsin's most celebrated export gets the royal treatment on I-94.

The remains of a religious colony, its amusement park, zoo, and baseball empire.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

When beetles destroyed these trees, they found new life as fantasy sculptures.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

A giant steel sculpture with animals in its shadows.

A Seussian sculpture made of brass instruments.

One of the largest festivals of flowers in North America takes place, appropriately, in the Flower City.

The gravestone of the suffragist leader attracted extra visitors during the 2016 election.

Former abode of notable poet, complete with literary references and stories of ghosts.