Real Life Wiki
Why?
Learn and have fun.
How?
An augmented reality app. When you see something while walking that you think is interesting, or you know an interesting fact about it, maybe you discovered something, etc., you just launch the app, point the camera at the object and annotate it with your insight. You can also check and see what others have contributed regarding this object or other objects around you (buildings, signs, flowers, etc.)
Icons made by Freepik