Ebrat Museum — ebrat means "lesson" or "warning" in Persian — is a former political prison that was used by the SAVAK (the Shah's secret police) before the revolution and by the Islamic Republic's security apparatus after it. The building is a distinctive circular structure designed on Panopticon principles, with radiating wings of cells visible from a central tower.
The museum presents the pre-revolutionary period as its primary subject: the torture methods used by SAVAK, the names and photographs of political prisoners, and testimonies from survivors. It is not comfortable viewing. The cells, some of which have been preserved or reconstructed, give a visceral sense of incarceration. Tours are conducted in Persian; English-language audio guides are available. The museum is sober and serious, without the triumphalism that sometimes mars similar sites, and it is worth visiting even if your Persian is minimal.