This app offers a lot of fun. Discover the secrets of Aachen, one of the biggest and best-preserved medieval cities in Germany.

Aachen is the home of the famous Aachen Cathedral and many other buildings from the Middle Ages. But not only that: It's also the home of several famous universities and the headquarters of one of the biggest research institutions in Germany, the Ruhr University.

Get an overview of the city, learn more about the different buildings and their history, and visit the famous Aachen Cathedral. And don't forget to look around you, there might be something interesting you could discover.