I'm not a pilot (so please don't shoot me down in flames), but regularly do j/seat trips around our network and I can certainly say that, from that perspective, Sion (SIR - I see that's already been mentioned) is pretty 'mad'. We operate to some odd airfields and others worthy of a mention are definitely Chambery (CMF - especially the approach to rwy 36), Geilo in Norway (DLD - compacted snow rwy with a 'hot sand blast' 10 mins before touchdown!), Fagernes (VDB - similar to DLD)and, as mentioned, INN (all with the RJ100). Certainly makes a nice change for our pilots from the usual Monday-Friday AMS,DUS,DUB's etc...!
T.A.