Långholmen Prison is a former prison located on Långholmen Island in Stockholm, Sweden. Built in the 19th century, it originally served as a facility for housing inmates. The prison was closed in 1975 and has since been transformed into a hotel and conference center, preserving much of its historical architecture. Today, visitors can explore the unique blend of history and modern amenities at the site. The building retains its original charm, with many rooms featuring prison cells converted into hotel accommodations. Långholmen Island is also a popular recreational area, offering scenic views and walking paths.