Far from the tourist traps and the crowded landmarks, you may have thought Edinburgh had no more to reveal, but the city still keeps many treasures hidden away in the most unexpected of places.Descend into a Cold War bunker, piece together guerrilla mosaics, unearth the most glorious of grottoes, genuflect before the wooden robot overlord, sniff out dogs more dazzling than Greyfriars Bobby, peruse a 17th-century list of ladies of pleasure, get water-boarded in a prototype Jacuzzi, travel to the Wild West of Morningside, discover hidden gardens and clandestine art that not even the neighbours know about.