I didn't spend long in Madrid, just a couple of days, but I did find some nice street art along the way. This piece in particular appealed, a Triptych on a appropriate building - a gym. There was some nice work in the photo realism of it all, and the scale was brilliant.
And this hiding in a back street, barely seen, highly graphic and colourful, just the sort of thing I look for, interacting with nature but in an urban setting.