D'you know, Apelles, I don't think I've ever taken even a single photo of them! Not in any detail, at least - just the one "look what we bought" general view to send to the relatives back in the beginning.
The barns I'm referring to were everything. The original dwelling house dates back to some time before 1750, at which point it was probably the 7x10m structure that's now our kitchen-dining-utility-bath-shower-room area, and what currently houses our two principal bedrooms would have been the original barn, 5x10m, with grain store overhead (7m-high ceiling, on top of the 3m high bedroom).
As the years passed and this particular farm grew in importance, another barn was added as an extension immediately to the east gable, then another, then another, then another, and at some point in all of that, someone knocked through from the original dwelling into the original barn to create living quarters for the domestic staff (we were told that, in living memory, thirteen people called that 50m² space "home"
)
By the time the last farmer retired and sold the property to our neighbour (in the late 80s/early 90s), the first barn appears to have been used exclusively for storing hay, straw and grain, with one part bricked off to create a "machine room" of sorts. The second barn was the cattle barn, and still has the wooden stalls through which they would have poked their heads to eat hay from the concrete mangers which are still there today; there's a full-height, tractor-width passage through this one (front to back) and a mezzanine left and right above the two animal enclosures.
The third barn was probably for sheep and still contains a pen for isolating some individuals - the ram, maybe? It's possible that this might also (or instead) have been where they kept horses. It has a very high ceiling, with numerous hatches to allow hay/grain to be poured down from the room above into wall-hung wooden and wood-and-metal mangers which I've salvaged and hope to restore in due course.
The fourth barn has traditional 60cm thick stone walls, but was split into two spaces at some point with modern concrete blocks, and has a poured concrete floor. They were being used as garages when we took ownership. At ground level, it's a distinct construction (you can still see the old east-facing doorway in the third barn) but the roof must have been re-made at that time as the space above Barns 3 and 4 is one enormous room, about 100m²
When the morning sun shines through the holes in the roof and accentuates the roof timbers, it's an amazing sight.
That's what we knew we were buying; then we discovered a whole other series of buildings on the west end (hidden by a giant, impenetrable mass of brambles) that were lumped together under the one word "sheds". These were the chicken sheds, pig-sties, rabbit hutches and general
"basse cour" buildings. The pig sties have long since been used as my winter workshop, the chicken shed (+indeterminate adjacent spaces) is the project of the moment.
That's why the whole lot needs to be re-roofed (but also where the hopefully self-financing solar roof comes in). 
