Yves de Vescy, Baron of Alnwick, erected the first parts of the castle in The castle is used as a stand in for the exterior and interior of Hogwarts in the Harry Potter films (though the wide angle images are computer generated).
Looking West along the River Tyne, 1978 Aerial view over Newcastle upon Tyne and Gateshead, showing the bridges across the River Tyne, April 1978 (TWAM ref. Tyne & Wear Archives presents a series of colour aerial photographs.
The showiest of a showy sequence - the Victorians (and Edwardians) rarely, if ever, missed an opportunity to make a feature of a corner building. They probably had a building code about it. If they had, the architect of this.