What's Causing These Strange Holes at Indiana Dunes National Park?

Wind sweeps over sand dunes along the shores of Lake Michigan at Indiana Dunes National Park. (Credit: Delmas Lehman/Shutterstock)(Inside Science) -- On the shores of Lake Michigan, near the northeastern tip of Indiana Dunes National Park, an approximately 125-foot-high dune rises into the air. Named Mount Baldy, the crescent-shaped mound is arguably the most famous sand dune in the park. Rangers lead visitors on summer hikes to the top."You get some gorgeous views," said Kelly Caddell,