This museum, located at Andrássy út 60 in Budapest, was used by both the Arrow Cross Militia (i.e. the Hungarian fascists during WWII) and the ÁVH (the secret police from the Communist era.) Specially-constructed (and diabolical) torture cells in the basement probably made it convenient to keep from one regime to the next.
Terror Háza is a museum of the atrocities committed by the fascist and communist regimes in Hungary. It is housed in a building, Andrássy út 60, that was used by both those regimes for torture and imprisonment of dissenters.