1. Ciutadella Park is a large green space located in the heart of Barcelona, Spain. It was created in 1888 for the Universal Exhibition held in the city and is now one of the most popular parks in Barcelona. The park covers an area of 70 acres and features different attractions such as a lake with rowing boats, a large fountain, a zoo, and various gardens. The park also houses several notable buildings such as the Catalan Parliament building and the impressive Castell dels Tres Dragons, which now serves as a library. There is also a mammoth statue and a greenhouse with exotic plants.

2. The park is open every day from 10 am to 10 pm. However, some attractions such as the zoo, may have different operating hours. It is possible to contact the park management at +34 932 56 30 65.

3. Admission to the park is free of charge. The park is easily accessible by public transport, with several buses and metro stations within walking distance. The closest metro station is Ciutadella-Vila Olímpica (L4), while the closest bus stops are 51, 39, and H14. Parking is also available in several areas around the park for a fee.