Secret Dublin Discover the inner sanctum of Freemasons Hall, see Napoleons toothbrush, marvel at a hoax plaque hidden in plain sight on OConnell Bridge, try George IVs footprints for size, venture into a Georgian time capsule on Henrietta Street, cross the bridge beneath which William Rowan Hamilton had his Eureka moment, explore a museum flat preserved exactly as it was almost 100 years ago, tune into the world of vintage radio in a Martello Tower, spot Dublins subterranean river, or post your thoughts in a mystery letterbox Dublin offers endless opportunities for getting off the tourist grid - for peering into the citys fascinating past and present. All you need to know is where to look and who to ask for. Secret Dublin is an indispensable resource for those who thought they knew everything about the city, or who want to discover its hidden treasures. Skip the crowds and clichés, and really get beneath the citys skin.