What's the one route you've flown (or driven) that you can still trace perfectly in your mind?

I've been thinking about the fly-by that wasn't supposed to happen — a night mission where we deviated from the filed flight plan, just once. I can still see every checkpoint, every ridge, the way the moonlight caught the river. It's been decades, but the coordinates are still there, like a scar. Anyone else have a path that's permanently etched in their memory?