Residents of this city, the second-oldest in its country, get one more public holiday than their compatriots, thanks to a 16th-century religious treaty …Photograph: APMerchants of this period patronised the arts and built the world’s oldest social housing complex.Photograph: Alamy Later years saw the birth of an influential playwright and the inventor of an eponymous engine. Name the city. Photograph: Donald Cooper/Rex Features 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 24 February 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 Chicago, US. The winner was Nigel Charlton-Wright, from Sandy, Bedfordshire. Photograph: David Sillitoe/The GuardianPhotograph: David Sillitoe/The Guardian