Viewfinder competition: win a £150 hotel voucher

This city, which became a Viking trading port and important settlement during the first millennium...
Photograph: Alamy

... lies a few miles upstream from one of the world’s largest natural harbours. It hosts well-respected film and music festivals which, like the city itself, punch above their weight. Photograph: Rex Feature

It is its country’s second (though some would argue third) city. Photograph: The Guardian

Name the city. 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 20 January to viewfinder@observer.co.uk or send a postcard, with your address and phone number, to Viewfinder, The Observer, Kings Place, 90 York Way, London N1 9GU. Last week’s answer was Okinawa Island, Japan. The winner was Hazel Humphreys from Wivenhoe, Essex. Photograph: Corbis