Co.Exist put the spotlight on a new tool for browsing Google Street View imagery today. It's called The Secret Door, and simply takes you to random spots around the world (inside and out) using Street View. Just click "Take me somewhere else," and move on. Simple, but incredibly addictive. It makes you appreciate the scope of imagery Google actually has (and they're far from done). If nothing else, it serves as a way to see a lot of interesting indoor photography. Here are a few of the first places the app took me.