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 gardens. In 2004 a large 'tree house' complex, including a cafe, was opened. It is deemed one of the largest tree houses in the world. In February 2005, a poison garden, growing plants such as cannabis and opium poppy, was added. May 2006 saw the opening of a pavilion and visitor centre designed by Sir Michael Hopkins and Buro Happold which can hold up to 1,000 people. As of 2011, there are still several areas to be completed, in order to fulfil the original design. Alnwick Castle has been used as a setting in many films and television series. Alnwick