Most of the activity in Chambon sur Lac is centred along the lake, and the older village had suffered - there was a post office with minimal opening hours, the inevitable Marie (town hall), a bakery with a small but excellent range, and a rather defunct-looking dead hotel. Even in the more vibrant part down by the lake there were no grocery shops; we had to factor in a visit to one of the larger towns nearby each day to shop for dinner.
The round building in the graveyard was described on the noticeboard in the village as a 10th century baptistery, if I remember correctly. I thought I took a photo of the sign, but haven't yet managed to find it.
The architecture is designed to withstand the rigours of snowy winters; as well as being a popular summer destination, winter sports are popular too, and many of the towns and villages had "extra" winter facilities; Besse-en-Chandesse has SuperBesse, Chambon had Chambon- des- neiges.