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 Castle east, separating the castle from the town. By the 12th century, Alnwick Castle had assumed the general layout which it retains today. It is distinguished as one of the earliest castles in England to be built without a square keep. The castle consists of two main rings of buildings. The inner ring is set around a small courtyard and contains the principal rooms. This structure is at the centre of a large bailey. As the central block was not large enough to contain all the accommodations required in later centuries, a large range of buildings was constructed along the south