All that glitters is not gold... this city made its name in the great South American silver rush of the 16th century.Photograph: AlamyIt is also credited for a sweet victory during the 19th century against the colonial power. Photograph: AlamyUnfortunately peace has yet to break out with its rival for title of capital of the country. Name the city. Photograph: AlamyThis 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 PeterboroughPhotograph: Alamy