The world's longest known cave system.

This Indianapolis landmark offers a secret panoramic view of the city. 

At the top of the hour, this steam-powered clock's eight brass whistles play "Back Home Again in Indiana."

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

Inspired by a piece of concrete, these three pyramid-shaped buildings have been beloved Indianapolis landmarks for over 50 years.

In the hills of southern Indiana is the idyllic studio and museum of legendary artist T.C. Steele.

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

Where beautiful signs live on forever.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

Don't get it twisted: This is the oldest pretzel bakery in the United States.

Yo, Adrian!

Indiana's oldest sternwheel paddleboat has been plying the placid waters of Webster Lake for 90 years.

You thought Santa Claus didn't exist, but it turns out you were wrong.

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

For over 100 years, this Indiana town has had a tree growing out the top of the local courthouse.

Display that gathers the basic elements of the universe in one convenient location.

Nature and art meet in this curvy creation

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.

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

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

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

A medical facility that has been kept frozen in time.

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

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