In Ciutadella, on one side of the park, there is a less crowded and more interesting place, a modernist building designed by Josep Fontserè and built by Josep Amargós between 1883 and 1887. Five arches built with steel beams and brick pillars cover it. The roof is made of wood and lets some light in, recreating the lighting of a rainforest. These conditions allow species originating from twenty different countries to be planted and grown in rows under the arches.
