iOS Picture copyright

Best way is to contact the person where you're getting the image from, if it's public property, like buildings etc, you should need to contact the owner or state for copyright laws, that's why in our app Kiddo Atlas, we have issues with adding monuments, because of the effing laws..

As above some buildings themselves are copyright and you cannot reproduce images of them without permissions. But to answer the question fully: yes all photographs are automatically copyrighted by the person who took them. Unless explicitly stated otherwise you need to obtain permission (probably pay) to use them

Not sure were you are in the world but try looking up your local Architects Professional Association. Website or phone they should have a Media & Education officer who should be more than happy to give you the Architects official line on how to properly deal with the copyright of the Architects works in the images you want to use. They might even have information they can feed you ready for use without issue.