My two cents: I just came across the Timetraveler Berlin Wall app, which visually reconstructs the Berlin Wall when standing in front of different sections of the Wall. (https://www.youtube.com/watch?v=CY9f6UJZlmM). The app includes informative videos and pictures of what once was there… I think that’s pretty cool! Sometimes it could be hard for students to imagine how a certain place looked like in the past, imagine having this kind of app for all cities? I’m thinking social sciences, field trips and, of course, tourists.