Parc de la Ciutadella is a large public park located in the heart of Barcelona, Spain. Established in the 19th century, it covers 70 acres and features beautiful gardens, walking paths, and a lake. The park is home to several notable structures, including the Catalan Parliament and a grand fountain designed by Josep Fontserè. Visitors can enjoy various activities in the park, such as boating on the lake or picnicking on the lawns. The park also houses the Barcelona Zoo and the Museum of Natural Sciences, making it a popular destination for families and tourists alike.