The downtown Honolulu YWCA, also known as the Laniakea, is considered a historic building. It was used as a filming location in: 1. * 1x21 "The Greater Good", as the Mosque where Sayid met his old friend 2. * 1x18 "Numbers", as the Santa Rosa Mental Health Institute 3. * 2x18 "Dave", as the Santa Rosa Mental Health Institute This branch is located at: 1040 Richards St. Honolulu, HI 96813 Telephone: (808) 538-7061