Reputedly the last time The Beatles were photographed together, in August of 1969 at John Lennon's house in Tittenhurst. (I thought that "Tittenhurst" meant one's brassiere was too tight. I'm not an expert, though.) More pictures at this Flickr set.
Apart from Lennon's apparent allergy to lawn mowers, what strikes me about this is how freaking big George Harrison's head is. It's beginning to scare me.