Viewfinder competition: win a £150 hotel voucher

Ever since ancient times this port city has been a gateway for traders and explorers … Photograph: Corbis

…including a famous Portugeezer who stayed a while longer than he bargained for. Photograph: Allsport UK

This rich blend of nationalities and religions – it is the home of the country’s oldest synagogue and oldest church – made for a spicy mix. Name the city. Photograph: Bob Krist/Corbis

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, 18 August 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 Marseille. The winner was Lisa Taplin, from Luton.
Photograph: Alamy