If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

An abandoned meat mecca now serves as an excellent locale for urban exploration.

One of the world's earliest skyscrapers.

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

An abandoned factory along the Mississippi coated by a giant mural.

This historic lavatory leftover features two levels of defecation stations completely without context.

Train cars and railroad artifacts abound at this restaurant devoted to railway history.

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

This mausoleum is the final resting place of one of St. Louis's richest and most tragic families.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

A collection of outdoor art by renowned muralist Robert Dafford depicts the history of a flooded city.

Built in 1869, this now-retired structure looks more like a medieval fortress than a county lock-up.

One man's unrequited love stands in a glass box forever.

The mysterious white squirrels of this Illinois city are treated like sacred cows.

Mass graves and Victorian monuments mark the history of Memphis in this 19th century cemetery.

Elvis's own personal tropical hideaway.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

Walk the whole Mississippi River!

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

Taxidermy, Cigar Store Indians, A Model of a New York Tenement and Delicious Draft Root Beer.

Man-made geyser that rises to the exact height of the Gateway Arch.

Tombstones carved to look like tree trunks are used for multiple generations of family members.

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

Part of a worldwide art project, this mysterious semicircle of concrete shapes holds the pieces of a larger story.