Viewfinder competition: win a £150 hotel voucher Name the place and win a £150 hotel voucher, letting you stay at thousands of hotels worldwide. Email your answer by Thursday, 28 July to viewfinder@observer.co.uk Tweet This city has changed its name three times over the centuries, and it has been the country’s capital on two occasions. Photograph: Alamy One of the key world events of the 20th century began here, and it is the birthplace of the country’s present formidable leader. Photograph: REUTERS A group of old rockers name-checked it in a devil-worshipping 60s classic. Name the city. Photograph: Gered Mankowitz 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, 28 July 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 Norwich. The winner was Rachel Sirotinina of DurhamPhotograph: Yury Goldenshteyn/Demotix Photograph: Yury Goldenshteyn/other