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The Magazine Fort is a bastion fort and magazine located within the Phoenix Park. Built in 1735, it was occupied by British Armed Forces until 1922 when it was turned over to the Irish Defence Forces after the Anglo-Irish Treaty. The Irish Army continued to operate the site as an ammunition store through the mid-20th century. It was fully demilitarised by the 1980s. The fort is now managed by the Office of Public Works. As of 2015, it was in a derelict state and not open to the public.

Phoenix Park is an urban park in Dublin, lying 2–4 km west of the city centre, north of the River Liffey. Its 11 km perimeter wall encloses 707 hectares; it is one of the largest enclosed recreational spaces within any European capital city. It includes large areas of grassland and tree-lined avenues, and since the 17th century has been home to a herd of wild fallow deer. The English name comes from the Irish fionn uisce meaning "clear water".