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Ciutadella Park serves as Barcelona's green oasis and dates back to the 19th century. Spanning 280,000 square meters, this historical garden features the city zoo, Catalan Parliament, a picturesque lake, and several museums. Visitors should not miss the adjacent Arc de Triomf, which was constructed as the main access gate for the 1888 Barcelona World Fair. It's an excellent spot for a peaceful stroll or a picnic amidst nature.