Cordoba

Cordoba surprises as Argentina's second-largest city, surpassing #5 Bariloche in population with 1.5 million residents. Its Jesuit Block, a UNESCO World Heritage site, features 400-year-old buildings and the nation's oldest university, founded in 1613. The nearby Sierras Chicas offer 200 km of hiking trails, attracting 2 million visitors each year for rappelling and paragliding. With a nightlife scene that ranks 30% larger than Salta's, Cordoba blends history with modern vibrancy.