Transylvania - a region in central Romania that most people have heard of but few can place on a map. It is a land of mystery and mythology and home to some of the biggest wolf packs in the world who roam across seemingly endless untouched mountain ranges. It is a sanctuary to vast ancient forests that have never seen a chainsaw and are the realm of the magnificent lynx and European brown bear. It is a land where crumbling medieval villages abandoned by humans long ago have been resettled by elegant storks - the mythical child-bearers of olden times. There are bats in the crumbling castles, and in the Basilica, we follow one family of mouse-eared bats as they struggle to bring up their fragile young in the ruined walls.