This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

This multisensory alley has the ability to remind bustling citygoers to stop and smell the roses.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

A modern-day wunderkammer dedicated to Indianapolis history, Afrofuturism, and musical vibrations.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

A local prank turned town icon.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

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.

A lush green oasis in the middle of Chicago.

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

Chicago's museum dedicated to the history of bondage and fetishism is more textbook than titillation.

The only thing sweeter than the potatoes is the canine proprietor of this roadside stall.

Makers and sellers of the original and finest York Ghosts.

The oldest candy store in the world has been selling traditional sweets since 1827.

Thanks to a spelling mistake this bizarre beaver-tiger hybrid became the symbol of a Siberian town.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

This giant wooden treehouse within a sprawling garden has its own eatery.

The ghosts of Britain's telecommunication past sit rusting away in a small village in England.

In the loving memory of a tragically deceased role-player this Illinois park is decked out with both dungeons and dragons.

A massive bur oak tree believed to be some 500 years old is the centerpiece of this quiet urban greenspace.

This small-town park in southern Illinois has a 1,000,000-gallon swimming pool and a 100,000-barrel oil well.

A Japanese temple, old German townhouses, and public chess tables offer a peaceful escape from the bustle of the North Side.

In a grove of fast growing walnut trees outside Paris, Illinois, a marker shares the story of a fictional road building culture.