I am helping put together a multiplayer USA IFR tour.

I need some info on some really challenging IFR type approaches in the US. The runways need to be able to handle at least a 737 and has to have one of three types of approaches.  ILS, VOR or NDB approach, and have challenging approaches, either from a standpoint of obstacles, altitude or special requirements.

Any help would be greatly appreciated 
Thanx