Durham Castle and Cathedral were lovely to visit but unfortunately not as tourist friendly as I would’ve liked them to have been. The castle itself has been completely turned into student accommodation. There was a really cool Harry Potter dinner hall to visit (I’m pretty sure it either was the filming location or was the place that inspired the main food hall in the films) and the cathedral itself had a really cool lego model of it inside (which my little girl loved). Pretty town though and definitely worth spending a half day in and around :)