Mill Bluff State Park near Camp Douglas, Wisconsin preserves a striking cluster of steep sandstone bluffs that rise from otherwise flat ground and have long served as landmarks for travelers. Shaped about 12,000 years ago when Glacial Lake Wisconsin covered the area, the bluffs were carved by waves over roughly 3,000 years into sharp profiles like inland sea stacks. Their survival reflects the region’s place in the Driftless Area, which escaped glaciation. The park includes ten named bluffs, several with petroglyphs about 400 years old, and later gained protections through its inclusion in the Ice Age National Scientific Reserve and designation of Mill Bluff State Natural Area.