Head down the alley to the left of the cathedral  to reach the Museo Inka (corner of Ataúd and Túcuman, 8 a.m.–7 p.m. Mon.–Fri., 9 a.m.–4 p.m. Sat., US$3.50).
This ornate colonial home contains an interesting collection of Inca objects, including jewelry, ceramics, textiles, mummies, and a variety of metal and gold artifacts. It also has the world’s largest collection of qeros, wooden cups the Inca used for drinking.