Viewfinder competition: win a £150 hotel voucher

You could be blown away by this city – the earth may even move for you. Photograph: Pete Turner/Getty Images

Cool in several ways, it is named after an Anglo-Irish soldier, and birthplace of two acclaimed film directors.
Photograph: North Wind Picture Archives/Alamy

Brave the cold and dive on an accessible wreck, or tackle rocks that were good training for a bigger climb. Then refuel on great fish and chips. Name the city.
Photograph: Alamy

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, 19 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 Santander, Spain. The winner was Rachel Thompson, from Shoreham, West Sussex. Photograph: Danita Delimont/Getty Images/Gallo Images