Just west of the parque central, the Museo de la Revolución Salvadoreña is an excellent museum that charts the causes and course of the armed struggle with photos, posters, weapons and histories of those who served and died in action. Weapons range from high-tech hardware to homemade bombs and mines. Behind the main building are the remains of the downed helicopter that carried Lieutenant Colonel Domingo Monterrosa, head of the notorious Atlacatl Battalion, to his death.

The studios of the FMLN's clandestine station Radio Venceremos (We Shall Prevail Radio) are also here; an elaborate hoax involving a radio transmitter rigged with explosives was what brought Monterrosa's helicopter down. Exhibits are in Spanish and English; tours of the museum are led by former guerrillas in Spanish only. Local crafts, books and T-shirts are sold in the museum's shop.