I was checking out my house on the satellite photos from Google Maps and I noticed that the satellite photo for San Francisco must have been taken on a day when there’s a festival in the Castro. The street is full of people and there are little tents in the middle of Castro street. Market Street is closed off too, you can see the stage set up. Must be Castro Street Fair or the Eureka Valley fair. I checked out City Hall and there’s nobody there, so it can’t be Pride. There’s a bunch of people in Union Square too, but that happens all the time. Neat though. One of those little pixels might actually be me.
Google Satellite image of 18th & Castro - San Francicso

Update
Also check out shreddies.org. It a bunch of kinda cool stuff people have found on the satellite photos. I sent this one in and it got posted .