Parc de la Ciutadella is Barcelona's first public park and the loudest green space in the city. A tiered stone Cascada pours water at one end, rowing boats cross the lake below it, monk parakeets screech in the palm crowns, and children queue to climb a life-size mammoth. Three buildings left from the world's fair of 1888 stand among the trees: a café-castle of bare brick and iron, an iron-and-glass greenhouse, and the Umbracle, a slatted timber shade house full of palms. The ground under all of it was a military fortress until the city tore it down.
The citadel was built after the siege of 1714 on ground cleared of the Ribera quarter's houses, and demolition began in 1869. Josep Fontserè, a master builder rather than a licensed architect, won the competition to lay out the park, submitting under a motto calling parks the lungs of a city. He drew the lake, the promenades and the Cascada, and put an architecture student named Antoni Gaudí to work on the waterworks. The zoo takes the eastern side, the arsenal that was never pulled down now houses Catalonia's parliament, and on Sunday afternoons drums start up on the grass.