Yup! I have one of those wooden cable drum thingies. A pallet platform topped with marine ply, 2 huge great tree root/stumps and I built 'goat henge' out of slabs of rock. sounds terribly impressive bit isn't but they like bouncing on whats left
All time favourite though, my goat spot is what used to be the local farmers dumping ground for subsoil and harcore. We have a mound of it about 15-20 feet high. He said he would bring the JCB and get rid of it for me, instead I asked if I could run their fence round it. They spend all day on their mountain and even dustbathe on it in summer. I didn't even know goats dust bathed!