Know where this is? Take a guess and let us know in the Comments.

Update, 10.24.13: Jef Poskanzer correctly identified this as an old siren at Indian Rock. Congratulations on being this week’s winner, Jef!

Photo: Chris Rooney.

Tracey Taylor is co-founder of Berkeleyside and co-founder and editorial director of Cityside, the nonprofit parent to Berkeleyside and The Oaklandside. Before launching Berkeleyside, Tracey wrote for...