The opening scene in El Topo. Can't find a video for it but it has little boy penis in it anyways so maybe that's a good thing (not why I like it! haha). It's just got an iconic -- to me -- atmosphere. A lonely desert.
In Stalker, the scene where the 3 people are right outside the room and they wax philosophic. But again, I can't seem to find a video so this scene (the ending) is also very cool.
I like the ending of V for Vendetta, though that fight scene is cool. I like the ending because it pumps me up.
There are tons but there's a few anyways. I mean, every movie I like has an awesome scene in it or 80.