There's no way this is legal, at least in the USA.
In the USA, for instance, we have people getting charged with crimes for taking pictures of farms. Farms have a lot less importance to Terrorists than Post Offices. For instance, have you ever heard of a Terrorist lacing a farm with ricin or anthrax? NO! But you have heard of a Terrorist sending ricin and or anthrax in the Post! QED!
In the USA, for instance, we have people getting charged with crimes for taking pictures of farms. Farms have a lot less importance to Terrorists than Post Offices. For instance, have you ever heard of a Terrorist lacing a farm with ricin or anthrax? NO! But you have heard of a Terrorist sending ricin and or anthrax in the Post! QED!