Post your guesses in the comments section below.
Guess correctly and be crowned "San Lorenzo know-it-all" for the week.
Congratulations to for correctly guessing last week's photo challenge. The pillar is part of a tomb stone at the San Lorenzo Pioneer Cemetery.
Have your own photos around town that you'd like featured in Castro Valley Patch's photo challenge? Send them to firstname.lastname@example.org and see if you can stump our readers!