One way architecture supports surveillance is through windows. Windows are a form of natural surveillance in architecture. When you are inside or outside a building you can see and monitor what is happening. Windows can overlook entrances, public areas, lobbies, etc. Windows can help lead to a safer environment because they allow you to see what is happening around you.
Here is an example of a window that would serve as natural surveillance for the people who live in this house. You can see out the window, so if someone is at your door you can see who it is before opening it. It also just allows you to see what is happening outside at all times.