Here's one from Edinburgh, with a classic Royal Mile tenement rising five storeys from the street level:
A couple of other neck-strainers below the cut
This is Nimes cathedral, down the side of the bell tower...
The really odd non-existent West end of Narbonne cathedral. Just to the right of this is the cathedral choir, which is roughly cut off by a stone infill wall. Then there's (from right) a bit of much later bracing stonework across what should be the transept, one fully formed bay of the nave marooned among incomplete build, and another bit of bracing wall to make sure the whole thing doesn't fall!
And stained glass being used as a flat roof at my Montpellier hotel - I love it, even though as you can see keeping it pristine isn't top of their list.