The Underground Prisoners Museum in Acre is a significant historical site that was once the main prison in northern Israel during the British Mandate. This citadel, built on the remnants of a Crusader fortress, played a crucial role in the period leading up to the establishment of the State of Israel. It commemorates the Jewish underground resistance movements—Haganah, Irgun, and Lehi—and their struggle against British rule. The museum not only preserves the memory of those who were incarcerated there but also educates visitors about the complex history of the era.