In Cairo, at the world famous Museum of Egyptian Antiquities, commonly known as the Egyptian Museum, photography is forbidden. It isn't just flash photography, it's photography of any kind. In fact, you can't even bring your camera into the museum. If you have a camera with you, the guards turn you away. You must leave your camera in your car, bus, or other place. The Museum doesn't have a place to “check” cameras.
The Museum, does permit cellphones to be carried into the Museum, but if you try to take a photo with it, be prepared to be roughly and emphatically escorted out of the Museum after you delete any photos taken in the Museum.