Among my absolute favorite mountain passes is undoubtedly the Timmelsjoch or Rombo Pass. It is a very unique location since I haven't seen that many photographs from this pass. The way up can be pretty busy tho since a lot of road enthusiast love driving these winding roads with incredible views. There are plenty possibilities to stop along the way and take some pictures. 

On the border to Austria this mountain pass has it all: steep winding roads, grandiose peaks and if you are lucky some really amazing adventure car driving past you!