This engrossing museum, set in a beautifully restored 15th-century warehouse, is home to a 2300-year old Iron Age logboat dredged up from Poole Harbour. At 10m long and 14 tonnes, it's the largest to be found in southern Britain and probably carried 18 people. It was hand-chiselled from a single tree; millennia later you can still see the blade marks in the wood.