Indian Echo Caverns is a historic show cave in Derry Township, Dauphin County near Hershey and Hummelstown, Pennsylvania in the United States.

[11][12] The Sweets of Solitude: Instructions to Mankind How They May Be Happy in a Miserable World, an essay reportedly written by Wilson during his time in the caverns, was published following his death.

and 1288, as well as coins from Argentina, Austria, Brazil, Egypt, England, France, Greece, Guatemala, and Italy, was found by Hummelstown resident Russell S. Zeiters while he and four of his boyhood friends were exploring the caves.

The box also contained a gold-mounted aluminum cameo inscribed with "My Mother," a dozen moonstones, additional pieces of jewelry, and a bottle of alumninum paint powder.

Visiting performers included Grand Ole Opry star Roy Acuff and the Hoosier Hot Shots from the Chicago National Barn Dance.

The geological system in which the caverns are located has been responsible for the creation of multiple sinkholes in an area stretching from Hummelstown to as far as Palmyra, and as far south as Middletown.