A relatively new museum on the Cidade Baixa waterfront opened in 2018 in a converted warehouse, telling the story of Salvador's carnaval as it differs from Rio's: a moving street party of two million people following trio elétrico sound trucks through Barra and Pelourinho for six straight days. The display includes historic costumes, video from the major blocos (Olodum, Ilê Aiyê, Filhos de Gandhy), and an audio room where you can hear how the music has shifted from the 1950s onward.
Worthwhile even if you have not seen carnaval in person. Allow two hours.