Agn K
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It is one of the Museum of Gdansk branches. Beautiful merchant's townhouse and exhibition gallery on the top floor, currently with the amazing silverware display. Due to the age of the building it is not accessible, you have to negotiate the staircase to see any rooms. Entry tickets are reasonably priced, and there are free tickets for disabled visitors and their carers, so you don't have to wait for Monday, which is free entry day.