Viewfinder competition: win a £150 hotel voucher Name the place and win a £150 voucher from Hotels.com, letting you stay at thousands of hotels worldwide Tweet All that glitters is not gold... this city made its name in the great South American silver rush of the 16th century. Photograph: Alamy It is also credited for a sweet victory during the 19th century against the colonial power. Photograph: Alamy Unfortunately peace has yet to break out with its rival for title of capital of the country. Name the city. Photograph: Alamy 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 boltholes to boutique hotels. Hotels.com customers can get a night free for every 10 stayed with its rewards scheme. Email your answer by Thursday 29 March 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 Antwerp, Belgium. The winner was Nicky Parnell, from Peterborough Photograph: Alamy