Dezeen archive: one of our most popular stories this week features a cafe where timber stalactites hang down from an undulating ceiling (top right), so we've compiled a selection of stories from the Dezeen archive about caves and grottoes. See all the stories »
Interior of a 1970's house in a volcanic bubble on Lanzarote: http://www.reinierdejong.com/2011/08/volcanic-cav…