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Among the attractions in Casco Viejo is the Mercado de la Ribera, which is the largest covered market in Europe, sprawling over 110,000 square feet. Here, visitors can find a wide array of fresh produce, meats, seafood, and dining options. Plaza Nueva, a neoclassical square constructed in 1821, is another notable stop, flanked by an arcade filled with shops and traditional Basque restaurants. On Sundays, the square comes alive with a flea market featuring coins, stamps, and flowers. Other highlights include the 18th-century baroque Church of San Nicolas, the Gothic-style Bilbao Cathedral, and the Teatro Arriaga, an opera house named after Juan Cristostomo de Ariaga, often called the Spanish Mozart.