Lions and tigers and leopards, servals, pumas, bobcats, lynxes, and ocelots... oh my!

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

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

A lesser-known part of the Kinsey Institute is this impressive collection of art, artifacts, and material culture related to human sexuality.

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

The world's largest anatomically accurate brain sculpture.

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

One-layer pyramid in Indiana.

The chiseled jaw of this forgotten American hero still stands tall in a small Indiana town.

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