The Minnesota Historical Society presents an 1881 pen-and-ink drawing of what later became the first national monument in the United States.

Official National Park Service site. Brief history, hours, maps, information on facilities.

Part of the Great Plains Prairie Cluster Ecological Monitoring Program. Inventory of plant and animal species, maps, meteorological data, bibliography.

Article on an anthropological mystery, by Thomas D. Thiessen. Petroglyphs near the Three Maidens were removed in the late nineteenth century, perhaps in a misguided attempt at historic preservation.