Prehistoric animals decorate this popular outdoor park.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

A historic hotel library in Indiana hides more than a few secrets on its shelves.

One of the first schools in the U.S. to admit students without regard to race or gender.

An unknown number of cholera victims are buried in two nondescript graves.

The humble Hoosier roots of a famed Broadway composer.

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

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

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

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

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

Modeled after the labyrinth in Chartres Cathedral, this small-town Indiana memorial labyrinth sits half a world away.

This mysterious hill seems to pull objects uphill.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

The first spinning jail built in the United States is the only one that still turns.

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

Symbolic attempt to overcome the issues of life.

If astronomy had a ghost, it would look like this observatory.

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

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

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

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

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

The national park was once a plantation estate.