I looks like someone was playing Minecraft on Google Maps. It shows up on a bunch of different maps too.
Google Maps location.
https://www.google.com/maps/place/3....0406944!4d-121.8400556!5m2!1e1!1e4?entry=ttu
Google Maps location.
https://www.google.com/maps/place/3....0406944!4d-121.8400556!5m2!1e1!1e4?entry=ttu