Museo la Casa
Museo la Casa (199 Callejón de la Capilla, Old San Juan) — Dedicated to the artistry of the printed word, this museum counts among its holdings approximately 400 books printed before the 15th century—one of the larger such collections in the Western hemisphere. It also owns two royal decrees from King Ferdinand and Queen Isabella that date back to 1493, the year Columbus first reached Puerto Rico. Because the museum is in a temporary location while long-term restorations to the permanent building are underway, only a small portion of the 6,000-piece collection is on display: you can see a page from the Gutenberg Bible and a 12th-century lunar-cycle calendar, which is impressive and worth a quick look. The gift shop has a terrific collection of posters that draws customers from all over the world.