Knight Foundry is a water-powered machine shop and foundry founded in 1873 in Sutter Creek, California. It looks like they're in the process of finalizing their recent historical preservation efforts. Here are some short videos from a recent open house event:
https://www.youtube.com/watch?v=ilGJUPG8f3E
https://www.youtube.com/watch?v=CzCMlgmH5uY
https://www.youtube.com/watch?v=D7YQRyRhl2c
https://www.youtube.com/watch?v=dYd3NOCk0SM
https://s3-us-west-1.amazonaws.com/h...t_foundry1.jpg
More: Sutter Creek Knight Foundry Water-Powered Foundry and Machine Shop Historic Site