At Llaviucu Lake there is a picturesque ruin. Our guide told us it was the site of a German Brewery that was established there before WWI. What a fab location. Now the only other buildings there are a lodge where you can stay (but you need your own linen and everything) and a covered walkway on the far side of the lake, part of the Sendero Uku path around the lake. This is an easy walk around the lake once you traverse the narrow, pebbled road to get there.