The main legacy of the 1888 World Fair is the Ciutadella Park: the World Fair served as the opportunity for Barcelona to rid itself of the hated citadel and transform it into a central park for the city's denizens. The entire Ciutadella Park in its present layout is a product of the World Fair, with its monumental fountain and small ponds, its Castell dels tres dracs (Castle of the Three Dragons) built by Domènech i Montaner to house the World Fair's café / restaurant, which later served to house the Zoology Museum, Hivernacle (Glasshouse or Greenhouse), the classicist Geology Museum and the Umbracle (a remarkable shaded structure for plants). Another product of the World Fair is the Modernista or Neo-Mudéjar Arc de Triomf (triumphal arch), the Fair's former gateway, presiding over Passeig de Lluís Companys. Other architectural details[which?] in the city bear witness to the passage of the World Fair as well.