In Grand Theft Auto IV and Grand Theft Auto: Chinatown Wars, the Old Hospital refers to the ruins of a former hospital on the south end of Colony Island in Algonquin, Liberty City. The name of the hospital is derived from "The Snow Storm", a mission in GTA IV that takes place at the hospital.
Based on the remains of the Smallpox Hospital in Roosevelt Island (as known as the Renwick Ruin), the Old Hospital is a gutted building with all the upper floors of the building collapsed and crumbling walls; the hospital can be also entered by its open top, making the Old Hospital very unique from other buildings in Liberty City. During singleplayer, some hobos or prostitutes may occasionally spawn.
In GTA IV's multiplayer Free Mode, the hospital can be used by players to organize SWAT training, tactical entry training, or ambushing. Police oriented clans (or teams) on multiplayer often train recruits in this building for its tight corners, open rooms, careful advancements, and long hallways.