The Botanical Garden and the University Library rooftop garden host an extensive collection of rare domestic and foreign plants, while a palm house in the New Orangery displays plants of subtropics from all over the world. Mokotów Field (once a racetrack), Ujazdów Park and Skaryszewski Park are also located within the city borders. The oldest park in the Praga borough was established between 1865 and 1871.