River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

This historic hotel invented the chocolate brownie.

A hollow cement depiction of time's inexorable effect on the human body.

The subtle science of a master molecular gastronomist.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

An antiquated German apothecary on Chicago's North Side.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

A speakeasy takes on Chicago's drinking culture.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

At a site that has witnessed many significant events, according to the fictional Kcymaerxthaere, it is best known as the place of lunar discovery.

A large stone map of Arkansas awaits visitors to its highest point.

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

An extravagant western hotel where every floor is the "ground floor."

The Old Mill shown in the opening credits of “Gone With the Wind” is actually fairly new, and was never a mill at all.

This century-old roadside attraction is full of bizarre rock formations.

An ever-growing collection of rare and strange objects owned by local Arkansas illusionist Maxwell Blade.

A hillbilly theme park that proved so unpopular the land wouldn't even sell on eBay after it closed.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.

The only diamond mine in the world where you can keep what you find.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.