St Mawes Castle is among the best-preserved of Henry VIII’s coastal artillery fortresses, and the most elaborately decorated of them all. One of the chain of forts built between 1539 and 1545 to counter an invasion threat from Catholic France and Spain, it guarded the important anchorage of Carrick Roads, sharing the task with Pendennis Castle on the other side of the Fal estuary. Parking available on site.