Idea 1: VR City Viewer- City viewers like those on observation decks. Instead of zooming in on landmarks, you focus on an area, choose a year based on a list of possible years/decades, and look through the lenses to see what that exact area looked like in the past as a virtual reality experience. It would be created through a mixture of historical photographs, information sourcing and historical maps.
Idea 2: QR codes around the city- QR codes would be placed around the city on light poles, in local businesses, etc. Scanning the code would produce a historical photo and history of the area. Local businesses could also sponsor posts.
Idea 3: QR codes on local items that would allow the person scanning them to know the local history of the item, for example, scanning local produce could show where the orchard is or scanning a piece of locally made jewelry could tell the person about the artist who made it or take them to their website.