The world's longest known cave system.

A local scoured more than 1,000 acres for stone to create his masterpiece.

World's largest collection of Coke-related items not held by the Coca-Cola company.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

A curiosity-seeker's paradise set inside a three-story historic school house.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

The longest navigable underground river in the United States is home to countless blind and albino animals.

This unassuming home was once “grand central station” for the Underground Railroad.

This Indiana walk of fame honors music legends with record-shaped plaques in the pavement.

A giant lumpy candle serves as a beacon for this highly scented pit stop.

The world's largest collection of mechanical puzzles is a cornucopia of analog bafflers.

The large rock formation where the Shawnee prophet Tenskwatawa stood and encouraged his warriors during the Battle of Tippecanoe.

Historians and hobbyists head to this former French outpost for the annual Feast of the Hunters' Moon.

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

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

This library and museum is dedicated to the life and literature of the Indianapolis native author.

This stately clubhouse has showcased German-American culture for over a century.

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

The largest historic preservation organization in the United States.

This whimsical park encourages its visitors and wildlife to roam on and around the various works of art.