Ive done the number one a couple times.
1. Telluride Regional Airport
Telluride is the highest-elevation commercial airport in America at 9,070 feet. It also features 1,000-foot sheer cliffs on both ends of the runway and strong vertical turbulence during winter months caused by the mountain winds. I have flown into this airport many times and it is for sure a white-knuckle experience.
And it is in a box canyon with fourteeners ahead and on both sides. Once you get down in there, going around is very iffy.