Museo Pablo Casals (101 Calle San Sebastían, Old San Juan, 787/723-9185, Tues.–Sat. 9:30 a.m.–5:30 p.m., $1) commemorates the career and accomplishments of Pablo Casals, the renowned cellist who performed for Queen Victoria and President Theodore Roosevelt, among other world movers and shakers.
Born in Catalonia, Casals moved to Puerto Rico  in 1956. A year later, the island established the annual Casals Festival  of classical music, which continues today. Inside an 18th-century building, the museum contains Casals’s music manuscripts, cello, and piano. You can hear recordings of Casals performing in the music room upstairs.