One of the prison blocks behind the prison garden at HMP Holloway, the main womens prison in London. HM Prison Holloway (sometimes known as Holloway Castle) is a closed category prison for adult women and Young Offenders, located in the Holloway area of the London Borough of Islington, in north and Inner London, England. The prison is operated by Her Majesty's Prison Service. Holloway Prison holds female adults and young offenders remanded or sentenced by the local courts. Holloway prison offers both full-time and part-time education to inmates, with courses including skills training workshops, British Industrial Cleaning Science BICS, gardens and painting. There is a family-friendly visitor centre at Holloway, run by the Prison Advice & Care Trust (pact), an independent charity.