Alnwick Castle in the period 1798–1814. The Abbot's Tower houses the Regimental Museum of the Royal Northumberland Fusiliers. An increase in public interest in the castle was generated by its use as a stand-in for the exterior and interior of Hogwarts in the "Harry Potter" films. Its appearance in the films has helped shape the public imagination regarding what castles should look like. Its condition contrasts with the vast majority of castles in the country, which are ruinous and unfit for habitation. The River Aln flows past the north side of the Castle. There is a deep ravine to the south and
Warkworth Castle their property was confiscated. On 1 August 1464, as a result of suppressing Lancastrian rebellions in the north for the previous three years, the title of Earl of Northumberland was given to the Yorkist John Neville, 1st Marquess of Montagu, and with it, the castle. During his tenure, he constructed a twenty-five-foot tall rectangular tower, built for defence, "with [arrow] slits in the three outer walls;" this is known as 'Montagu's Tower' to this day. His brother, Richard Neville, 16th Earl of Warwick, used Warkworth as a base from which the Lancastrian-held castles of Northumberland – Alnwick, Bamburgh, and Dunstanburgh