Millie Hill bat cave

Millie Hill Bat Cave Viewing Area
LocationMillie Hill Bat Cave Road
Nearest cityIron Mountain, Michigan
Coordinates45°49′16.02″N 88°3′22.12″W / 45.8211167°N 88.0561444°W / 45.8211167; -88.0561444

Millie Hill bat cave (also known as Millie Mine bat cave) is an abandoned iron mine in Iron Mountain, Michigan that is now one of the largest bat breeding colonies in North America. The vertical mine shaft is blocked by a steel grate, which prevents entry by humans but allows bats to enter and exit freely. The bat cave is designated as an official Michigan Wildlife Viewing Area.

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