Working abroad for a while is a great idea!
At least for me, it has helped to round myself out as a designer and to gain a perspective that is hard to get from just sitting at a desk.
Germany is a good call with Munich probably being the ID hotspot. Most of the large international consultancies are there such as IDEO, Frog and Designit. Otherwise, you got some cool stuff happening in the Nordics.
UK and mostly London is a little tricky right now due to Brexit and I might wait a little to see how that will shake out.