Island Paradise post, I mentioned that the Churchill Barriers were built using labor provided by a bunch of Italian prisoners of war from the North Africa campaign. (I imagine it must have been quite the shock to go from the deserts of North Africa to the austere conditions in Orkney.) The thing about Italians in the 1940's was that they were pretty devout Roman Catholics, and Catholicism wasn't exactly a big thing in Orkney. So, the Italians requested permission to turn a Quonset hut - the British term being a Nissen hut - into a chapel.
Visit Orkney, Orkney Communities, and Wikipedia. I've heard every now and again that there are concerns about its deterioration over time, but it seems to be holding up pretty well. The Italian Chapel features the stations of the cross, a beautiful altar, and ornate decoration that - if memory serves - is actually painted onto plaster. To look at the building from the side, you'd have a hard time telling what's inside, but the front (and possibly the back?) exterior have been converted to complete the appearance of a chapel. I don't believe any services are held there anymore - case in point, it was mid-day on Sunday morning when I visited.
With my visit to the Italian Chapel complete, it was time to head northwest to the Heart of Neolithic Orkney.