This elaborate estate contains a stunning marble aviary, a sunken conservatory, and a magnificent music room with a two-story pipe organ.

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

Locals dubbed this abandoned abode the "gingerbread house" because of its odd architecture.

This stunning gothic ruin was a casualty of the Indiana steel industry crash.

Ornate limestone building now filled with geologic specimens, and more.

One man's vision and a labor of love of many.

This mysterious hill seems to pull objects uphill.

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

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

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.

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.

Prehistoric animals decorate this popular outdoor park.

One of the largest collections of merchandise from the famous British sci-fi show can be found smack in the middle of Indiana.

A medical facility that has been kept frozen in time.

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

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

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

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

The world's largest anatomically accurate brain sculpture.