While ambling about Barcelona, Spain, I spotted these interesting three-wheeled vehicles:
Basically, you can rent these cars and they’ll take you on a GPS guided “talking tour” providing you with interesting tidbits along the way.
In the photo above, you see the GPS screen as well as the gauges on the console.
Might be a fun way to do your own tour of a major city. This company does have cars in other cities, which may be an option for your travel plans.