meltwaterfalls:
Then €26 to visit the mine
This is really expensive, although the cable car is included. The salt mine alone costs 19 euros, still a lot of money.
meltwaterfalls:
And yeah, the Olympic Stadium is at the top of my must see list
Yes, it's worth a visit, it definitely has the potential for a WHS. The pavilion roof is unique (it spans not only the stadium, but also the sports hall and the swim hall), and the concept of the whole area is exceptional. The architects wanted to create a contrast to the Berlin Games in 1936. The Olympic Park should demonstrate a new friendly and open minded image of Germany. From distance only the roof is visible, but when entering the stadium you see the playing field and the spectator stands at your feet. In contrast, the Berlin Olympic stadium is "Colosseum-like", visitors stand in front of huge, impressive walls.
You can visit the Olympic Stadium on your own (3 Euro entrance fee, I think), you can stroll around the whole arena and to the spectators area. There are also guided tours (once a day), there you have also access to the interior, the dressing rooms, the former VIP area and the VIP box. That's not very exciting, it has the atmosphere of the 70's, not to compare with the luxurious facilities in a modern arena. But I remember my visit some years ago, our guide provided a lot of information on the architecture and the history of the area, former uses etc.
I can also recommend to go up to the TV tower, you have a beautiful view of the Olympic Park, the former Olympic village and the BMW World.
The latter is worth the short walk from the Olympic Stadium, even if you are not interested in cars. The new BMW centre was designed by the Austrian architect group Coop Himmelb(l)au.
http://www.muenchenarchitektur.com/architekturhighlights/18-sonderbauten/31-bmw-welt Unfortunately, there are no longer football matches or other sporting events, but rock concerts and similar events. There were even car races some years ago. And this is probably the main problem of a future WHS bid: the owners do not want to be restricted in the use of the area for such events.
It must be said that Germany was very successful in getting inscribed its modern heritage (at least from the early 20th century). But there are still some modern architecture and technical/industrial sites that are worth to be considered for WHS. Unfortunately, none of them are nominated for the upcoming German T-List.