Naturally formed caves among the sandstone cliffs at Pictured Rocks National Lakeshore in Michigan's Upper Peninsula.

- Image ID: DGHC52
Naturally formed caves among the sandstone cliffs at Pictured Rocks National Lakeshore in Michigan's Upper Peninsula.
Larry Geddis / Alamy Stock Photo
Image ID: DGHC52
Naturally formed caves among the mineral seep sandstone cliffs along Lake Superior and Pictured Rocks National Lakeshore in Michigan's Upper Peninsula.
Location: Upper Peninsula of Michigan at Pictured Rocks National Lakeshore