The first exhibition will feature a London-based artist Sign up to Simon Calder’s free travel email for expert advice and money-saving discounts Get Simon Calder’s Travel email Get Simon Calder’s Travel email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice A new art gallery has opened in one of Barcelona ’s most popular tourist destinations. Casa Batlló, designed by venerated Catalan architect Antoni Gaudí, is one of the