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.