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
Alnwick Alnwick Garden; it dominates the west of the town, above the River Aln. The castle is the hub of a number of commercial, educational and tourism operations. From 1945 to 1975, it was the location of a teacher training college for young women and "mature students" (persons of more than 21 years in age). Currently, it houses American students studying in Europe through a partnership with Saint Cloud State University; it is the base of Northumberland Estates, the Duke's commercial enterprise; and is in its own right a tourist attraction. The castle is open to tourists from April to September,