guides are unusual and unfamiliar, allowing one to step off the beaten track. Now in it's third edition, Secret Dublin features 140 secret and unusual locations. Inside Secret Dublin - An unusual guide : Discover the inner sanctum of Freemason's Hall, see Napoleon's toothbrush, marvel at a hoax plaque hidden in plain sight on O'Connell Bridge, try George IV's 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 Dublin's subterranean river, or post your thoughts in a mystery letterbox ... Don't miss - Each chapter of this Secret Dublin - An unusual guide corresponds to a different part of the city so that one can always find a hidden or secret place to discover. Perfectly planned walks - Make sure that you do not miss any secret location, by discovering each one featured in this guide by planning a walking tour of each neighbourhood.