National Register Listings in Alger County, Michigan
Au Sable Light Station
Bay Furnace
Grand Island Harbor Rear Range Light
Grand Island North Light Station
Grand Marais Harbor of Refuge Inner and Outer Lights
King Road-Whitefish River Bridge
Lobb House
M-28-Sand River Bridge
M-94 (old)-Au Train River Bridge
Mikulich General Store
Paulson House
Pickle Barrel House
Schoolcraft Furnace Site
Michigan is the only state to have two designated "state stones": the Petoskey Stone, which is the state stone of Michigan, and the Isle Royale Greenstone, which is the state gemstone of Michigan. The Petoskey Stone is a fossilized coral that is found primarily in the northern Lower Peninsula, while the Isle Royale Greenstone is a rare mineral found only on Isle Royale in Lake Superior.