The historic centre is filled to bursting with dusty little stores selling antiques (look for signs saying 'Antyki' or 'Antykwariat'). A quick exploration of the side streets will reveal everything from WWII memorabilia to 19th century coins and navigational charts. Do remember when purchasing that permission will be required if you’re planning on taking anything pre-1945 out of the country – for the most part such a certificate will be provided by the shop, though do check beforehand.