Prospekt, B4 [⬆️]

Nova Prospekt is an old run-down prison that was, according to Alyx Vance, transformed into "something much worse" by the Combine. Featured in Half-Life 2, it is played throughout two chapters set between the Coast and the City 17 street battle chapters, Nova Prospekt and Entanglement. Prior to the Combine occupation, it was a high-security penitentiary; however, it was later acquired and used as a facility to process and detain citizens who were determined to be a threat - dubbed "anti-citizens." During Half-Life 2, it is used to contain Eli Vance, after he is captured by the Combine during a raid on Black Mesa East.