Antwerp is a spectacularly beautiful medieval city on the River Scheldt. The second largest city in Belgium, it has the largest port in the world. In Antwerp, history, art, the diamond trade, architecture, fashion, and centuries-old trades weave an intricate web that make for a memorable visit. Start your trip by exploring the centuries-old Diamond District, then visit old Grote Markt, a beautiful Renaissance square in the Old Town. Don’t miss Rubens House, a 17th-century building housing some of the most precious paintings by Antwerp’s favorite painter son. Stroll through the massive riverside fortress and feel the power at the Cathedral of Our Lady. Enjoy the narrow cobblestoned medieval streets lined up with fashionable boutiques or quaint sidewalk cafes. Take the kids to the Antwerp Zoo, Comic Station, and the petting farm De Schranshoeve, while you taste famous Belgian beers at the Antwerp Brewery. Since its foundation, the park has been controlled by De Koninklijke Maatschappij voor Dierkunde van Antwerpen, a society originally called Société Royale de Zoologie d'Anvers (The Antwerp Royal Society for Zoology). This also became the popular nickname for the zoo, "De Zoologie". The initial objective was to encourage zoological and botanical sciences. Its first director was renowned zoologist and botanist Jacques Kets (10 November 1785 – 1 February 1865). He accepted this position on one condition: a museum had to be built to house his nature-historical collections. This building was inaugurated in 1844 by H.M. King Léopold I. The predicate Royal was added to the name of the society on that occasion. Throughout the years, it has encouraged wildlife preservation through activities and exhibits on a recreational, educational, scientific, and cultural level. In its early years, the size of the park grew from less than 1.59 hectares (3.9 acres) to more than 10.5 hectares (26 acres). Notable buildings from that period are the Egyptian temple (1856) and the antelope building (1861) in Oriental style, which now houses the okapis. The zoo has also a cultural function. Originally, concerts were held in the garden of the zoo. The museum building was demolished to build a concert hall. The hall then became the residence of the Antwerp Symphony Orchestra, the symphonic orchestra of Flanders. The museum collections were moved to the second floor. For the 1920 Summer Olympics, the venue hosted the boxing and wrestling events. After World War II, the animal park was turned into a model zoo which conformed to new and modern scientific, educational, cultural and aesthetic standards. The animal compounds were enlarged and admitted more light. Buildings from this period include the primate building (1958) and the big jubileum complex, established on the occasion of the 125-year anniversary together with the nocturama (1968), which houses the nocturnal animals. The jubileum complex houses birds of prey and the sea lions. In 1973 a new compound for reptilians was built, and in 1978 a new building for smaller species of monkeys. The older primate building was renovated in 1989. To support its educational mission, the zoo started with group tours and special educational programmes called zoo classes in 1969. Around the same time, planetarium exhibits were installed.