Zugspitze

The Zugspitze is known as the "Top of Germany", as it's the highest point of the country.  From the top you can see 4 countries (Germany, Italy, Austria & Switzerland).  This is a magnificent, gorgeous view.  Words cannot do it justice.

To get there, you'd want to catch the Zugspitzbahn train in Garmisch-Partenkirchen.  You would take this all the way to the end of the line at the lake Eibsee (you'll need to change trains at one point).  From there, you take a lift all the way to the top of the mountain.  Up here, in addition to the beautiful views, there are also a few restaurants, which do have pretty good food.

When visiting, definitely allow yourself a good amount of time for travelling (both up and down) as it can take close to an hour each way, and you may be waiting for the trains/trams for a little while.