6. Desert House
This exhibit is lovely, but I have a problem of giving so much space to essentially a common species. For example, an oversized exhibit for a large colony of some endangered reptiles could be just as unusual and more important for conservation.
9. Rimba mixed species paddock
South Asia still contains - and contained more in the past - large areas of dry forest and savanna and grassland inhabited by large mixed herds of Asian elephants, rhinos, diverse wild cattle, deer, antelope etc. just as remarkable as herds of African plains.
This habitat seems to be completely overlooked by the zoo world, who portraits South Asia as rainforest only. Even if the actual Asian mammal species are mostly present in Europe in good numbers and have conservation plans.
Then we must agree to disagree. I can of course sympathise with what appears to the message of the exhibit, just not the way in which it is conveyed. Having visited the zoo a plethora of times, I have never seen visitors react to the exhibit in any way other than being slightly bemused by the exhibitry style. On a separate note, not sure that housing turtles in a completely sterile, tiled exhibit constitutes a 'must-see' European exhibit, but as I've agreed with most of, if not all, your other picks so far, I guess I won't take this any further.
This turtle kitchen exhibit was extensively discussed in one of EAZA publications and it contains all elements needed for turtle welfare, including a sandy nesting area concealed behind one of the pots.