The Lonely planet website describes Turku thus
This one-time capital of Finland has a very historic feel, being the country’s oldest city. While hardly any mediaeval buildings remain, a visit to the doughty castle and superb archaeological museum will stimulate your imagination into populating the riverbanks with bustling crowds of merchants receiving and dispatching Baltic cargoes
While its guide book called it ‘intriguing’. We thus had high hopes for the place, which were sadly dashed because very little remains of Turku’s visual heritage thanks to multiple fires and so on.