Last summer, I flew down to South America from MIA. We took the 5 oclock flight (996?) to Quito (Mariscal Sucre/UIO). The light faded, and the flight was smooth. That is, until, our descent in to the valley in which Quito is located. What a ride! Turns, major turbulence, and all without visibility from the windows except lights from below! When we were just about to land I was sure that we were going to hit a building of some sort, they practically form as soon as the runway ends. The landing was very hard, but we eventually stopped. Crazy good times. I ended up flying in to Quito two more times, one on an Icaro Fokker-100 and one on a TAME 727. None were as bad as this.
What are your most harrowing approach experiences?