Originally Posted by
flightlessbirds
Another possible train day trip: Lake Chiemsee or the Austrian border.
If you want to rent a car: exploring rural Bavaria/Allgau can also be a blast.
Well if your renting a car and going there, then visiting the Eagle's Nest is a must see!
https://en.wikipedia.org/wiki/Kehlsteinhaus
Amazing history and feat of engineering, especially considering when it was constructed.