There's a concert venue in Washington state in the US called The Gorge at George. A couple of years ago I traveled there for a concert. I was camping on site the night before when this incredible sunset occurred.
Woah.. what an amazing sunset.. And i know the concert venue you're talking about. My brother and my dad went there a couple years ago for a concert. Anyways, very well done and this is going into my favorites. -Sarah = )