The drawback is often overcrowded places, full of tourists whose presence will ruin this privileged moment. Secret Sacred Sites uncovers 100 lesser-known sacred sites often only known to locals, guaranteeing a fully authentic visit. In his forty years of pilgrimage, renowned National Geographic photographer Martin Gray has visited 160 countries and photographed hundreds of these lesser known sacred sites. Here he has selected his favourite hidden holy places, the result of a lifetime's quest.