Viewfinder competition: win a £150 hotel voucher

You have to be a bit of NOB to play for this city’s top foootball club, once home of one of the game’s most controversial players. Photograph: LatinContent/Getty Images

An emerging tourist destination, the city offers adventures by day, pulsating nightlife and beaches along a deadly-sounding river. Photograph: Alamy

A revolutionary born here made his name in a country 4,000 miles away. Name the city. Photograph: Getty

This week’s winner will receive a £150 voucher from Hotels.com which can be used at more than 120,000 places to stay across the world, from quirky B&Bs and family bolt holes to boutique hotels. Hotels.com customers can get a night free for every 10 stayed with its rewards scheme.
Email your answer by Thursday 17 May to viewfinder@observer.co.uk or send a postcard, with address and phone number, to Viewfinder, The Observer, Kings Place, 90 York Way, London N1 9GU.
■ Last week’s answer was Manila, the Philippines. The winner was Denise Loos, of Bromley, Kent Photograph: Alamy