Created in 1975, Iquique's zona franca is a massive monument to uncontrolled consumption – reputedly South America's largest. The entire region of Tarapacá is a duty-free zone, but its nucleus is this shopping center, housing over 400 stores selling imported electronics, clothing, automobiles and almost anything else.
If you want to shop, take any northbound colectivo (around CH$700) from downtown. Don't walk – it's surrounded by some of the worst neighborhoods in town.