Henness Ridge Fire Lookout - Credit: Wikimedia Commons
The Henness Ridge Fire Lookout in Yosemite National Park was built in 1934https://npgallery.nps.gov/GetAsset/9ba23bee-731f-44c9-9ae4-0483880af67b by the Civilian Conservation Corps (CCC) which was a public work relief program for unemployed men age 18-24. The CCC provided unskilled manual labor related to the conservation and development of natural resources in rural areas of the United States. Read more on Wikipedia
Source: en.wikipedia.org