(10) Whenever you are in a new city, you might look for a museum. Museum finder is an Augmented Reality webapp that will help you find one.
HTML5 web technology has greatly evolved in the last decade: Simple webpages can determine the user's precise location, his heading, and they can access the smartphone's gyroscope angles as well as its camera stream. These data can be used for building an Augmented Reality webapp that can interactively guide any user to the place he is looking for.
Needs: Data experts (Wikidata, SPARQL), designers