The Loire Valley is one of Europe where we find the greatest diversity of forms and functions related to underground cavities. On this occasion, many individuals will receive visitors in their own homes troglodyte. Visit the troglodyte invites the public to roam, all are different, surprising even disconcerting (houses, chapels, museums, castles, cottages, workshops ...). Some sites date from the sixth century, others have an unusual architecture and contemporary, daring mix of styles. You will discover troglodyte sites unpublished, never before open to the public free or at preferential rates.