Excuse me, in public, if there is no sign that says "no taking pictures", can I take pictures?

It is actually very difficult to explain the problem of not taking pictures. Generally, there will be obvious tips in art galleries, museums, military restricted areas and other places, but in some places, people will come out to stop taking pictures. I used to shoot large buildings and bars in Guanghua Road, Beijing. I was driven away by security guards many times and even threatened personally. If this really happens, it is suggested that LZ shoot under the premise of being legal and protecting itself and equipment, take candid photos or blind shot if necessary, and call the police in time in case of emergency.