Falmouth/Aberfal is a town with a deep natural harbour at the mouth of the Fal. Falmouth is the largest port in Cornwall and continues to be an important part of the local economy. The town is a popular tourist destination with beaches from Pendennis Castle to the Helford River and the National Maritime Museum Cornwall is located here. Close to Falmouth is Pendennis Castle which was built to defend the west side of the River Fal (opposite St Maws) by Henry V111. Other notable buildings include The Church of King Charles the Martyr commenced in 1662.