The Cave-In-Rock on the Ohio River, Illinois, was the hideout of the Mason Gang, led by Samuel Mason, who routinely robbed flatboats on the river. The Harpe brothers, on the run from the law, joined the Mason Gang here but were expelled by the pirates for their senseless cruelty.
Photograph by Daniel Schwen, 2008.
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Based on Wikipedia content that has been reviewed, edited, and republished.Original image by Daniel Schwen. Uploaded by Joshua J. Mark, published on 12 December 2025. The copyright holder has published this content under the following license: Creative Commons Attribution-ShareAlike. This license lets others remix, tweak, and build upon a work even for commercial reasons, as long as they credit the author and license their new creations under the identical terms. When republishing on the web a hyperlink back to the original content source URL must be included. Please note that content linked from this page may have different licensing terms.
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Cite This Work
APA Style
Schwen, D. (2025, December 12). Cave-In-Rock, Illinois: Hideout of the Mason Gang and Harpe Brothers. World History Encyclopedia. https://www.worldhistory.org/image/21442/cave-in-rock-illinois/
Chicago Style
Schwen, Daniel. "Cave-In-Rock, Illinois: Hideout of the Mason Gang and Harpe Brothers." World History Encyclopedia, December 12, 2025. https://www.worldhistory.org/image/21442/cave-in-rock-illinois/.
MLA Style
Schwen, Daniel. "Cave-In-Rock, Illinois: Hideout of the Mason Gang and Harpe Brothers." World History Encyclopedia, 12 Dec 2025, https://www.worldhistory.org/image/21442/cave-in-rock-illinois/.
