You go into a large multi-level parking garage, and would like to know where are the free spaces.
Each car entering is given a reusable parking card with dual functionality: use it to pay and exit, and it will show you on a map (a small screen) currently where you can find empty spaces to park, and where you are. It’s a live map guiding you to the available spaces.
If you walk almost anywhere, you will see plaques celebrating and informing you of interesting people and facts regarding many places (buildings, parks, etc.) There are much more of these than you see on these plaques and many a place where there is no plaque even though it has an interesting history.
An augmented reality app that when pointed at such a place gives you a list of all the interesting things that happened. Famous people who lived there, historical events, etc. You just point it at a building or even a few buildings, or a whole park, and see the list pops up on the screen beside the place you point at. You can them click on any of these to get many more details and the story.
Hasn’t it ever happened that you forgot where you left your car at the car park?
Take a quick picture with your phone of where you parked before leaving the car. Most car parks have some signage indicating location, so include that in the picture. Another way is for the car park operator to have a scannable code (like a QR code) visible for each space. You scan it, and it will tell you where it is so you can consult it when you want to leave.