Court yard of 400 y.o. university (disregard top doodles).
All those sketches I did on plein air, except for a gargoyle, I drew it from a photo I made. I can say that sketching on location is harder than I thought, but very entertaining, much more interesting than scrolling a phone.
Sometimes I do a sketch and still have some space left, I don't want it to be wasted, like one artist said - it's my real estate. :)