The places where "No Photography Allowed" signs pop up are getting more and more numerous. Sometimes photography is restricted for security, sometimes it's to preserve artwork, and sometimes, well, it seems it's just out of spite. Not that we're encouraging it, but many people still snap away regardless. Some of their shots live on Strictly No Photography, a site dedicated to compiling all of the images of places you weren't meant to photograph. You can search by photographer or category and pictures include museums, live performances, restricted areas of industrial sites, and more. The quality of these covert photos is (understandably) a little sub par, but it's still worth a look. For more photos of things you weren't meant to see, check out the No Photography Allowed flickr thread.