Essentially, a huge database system and potentially app where people can find urbex or interesting locations. Would also feature the ability for users to publish and add locations (with the option of it being anonymous), to encourage collaboration. Probably incorporating google maps API and a bunch of other things.
Also has ability to rate locations, add comments and pictures, and report locations that are incorrect or misleading. Each location could have a number of properties such as whether or not there’s security, whether it’s publicly accessible or trespassing, how dangerous it is, etc.