Heritage Open Day: A chance to visit part of Berwick's Ramparts not normally open to the public. Go through a walled tunnel leading to the eastern flanker which was constructed as part of Berwick's Tudor defences, an innovation in this country and also unique. Originally known as Middle Mount, the bastion was re-named in 1746 to commemorate the Duke of Cumberland who passed through Berwick on his way to confront the Jacobites at the Battle of Culloden. Berwick's fortifications were built between 1558 and 1569 when there was a real threat of invasion from the Scots. Berwick was the first northern European town to be defended by this system of rampart and bastion, the most advanced technology of its time.