The most popular and "living room" square in Lisbon is Rossio Square (officially Praça de D. Pedro IV). Located in the heart of the Baixa district, it has been the city's nerve center since the Middle Ages. It is famous for its iconic wave-patterned stone pavement (calçada portuguesa), its grand 19th-century bronze fountains, and the Dona Maria II National Theatre. While Praça do Comércio (Terreiro do Paço) is technically the largest and most grand square, situated right on the Tagus River, Rossio is the "most popular" in terms of daily activity, meeting spots, and historical weight. In 2026, Rossio remains the primary hub for both locals and tourists, serving as a gateway to the Chiado and Alfama districts. It is the place where people gather at historic cafes like Café Nicola, catch trains to Sintra at the Neo-Manueline Rossio Station, or simply enjoy the bustling atmosphere of Lisbon's urban core. For a visitor in 2026, Rossio is the essential starting point for any exploration of the Portuguese capital.