The Olympic and Sports Museum on Montjuïc looks at sport as spectacle, training, technology, and social history. Exhibits cover elite competition, recreational sport, disabled athletes, and the way Barcelona used the 1992 Olympics to reshape this hill above the city.
It is most worthwhile if you are already exploring the Olympic stadium, Montjuïc's museums, or the old games sites. Sports fans will get the most from it, but the Barcelona angle gives the museum a wider travel interest.