Somewhat off-topic, but how does one properly ask someone to take a photo? I travel by myself, and like to have one photo of myself with a famous landmark. Most of the time, there isn't a guide or other "official" employee. I usually keep an eye out for a couple or family who are taking photos, and offer to take one of all of them if they will take one of me. It sometimes takes a bit of charades if they don't speak English, but I haven't had any problems so far.