I've always liked having the ability to view public webcams around the world. During the last hurricane, for example, there was a camera streaming from an oil rig a mile or more out to sea that let us see the strength of the storm before it made landfall.
Now that I'm a homeowner, I wanted to put a camera on our roof and stream the view from up there. I bought a weatherproof Amcrest IP8M-2597EW-28MM and dropped it through the soffit under our roof. The process of snaking the ethernet cord through an air duct up to the attic will not be covered here.
Amcrest cameras act as RTSP (real-time streaming protocol) servers that can be accessed on a specific port. This means that it's necessary to run an active RTSP client to consume the live feed.