Birch Lodge Hospital and Summer Resort Sanitarium - Credit: Wikimedia Commons
The Birch Lodge, also known as the Birch Lodge Hospital and Summer Resort Sanitarium or the Trout Lake Sanitarium, is a resort facility located on the northern shore of Trout Lake, off County Route H-40, west of MI-123, in Trout Lake Township, Michigan. It was listed on the National Register of Historic Places in 1996 and designated a Michigan State Historic Site in 1987. Read more on Wikipedia
Source: en.wikipedia.org