The best castle in Northumberland? Certainly high up on my list, Bamburgh Castle is one of the largest inhabited castles in the country. The castles earliest recorded history begins in Anglo Saxon times when Northumbria was the largest and most powerful of seven kingdoms. The castle keep, the massive square structure is the oldest surviving part of the castle. Its mighty walls are eleven feet thick to the front and nine feet wide elsewhere. The Keep sits on a massive plinth to stop attackers dig