Empire Mine State Historic Park 
10791 East Empire St.
Grass Valley, CA 95959
530-273-8522
http://www.parks.ca.gov/default.asp?page_id=499
State Park: Birding, Hike, History, Horse, Picnic, Walk
The site of one of the oldest, largest, deepest, longest and richest gold mines in California. The park is in Grass Valley at 10791 East Empire Street.