forest is also rich in history, and its attractions include a Franciscan friary dating back to the early 18th century and two 17th-century wooden chapels. Out of a total of 44 parks in Łódź ( 11 have historical status, the oldest of them dating back to the middle of the 19th century. The largest of these, Józef Piłsudski Park (), is located near the Łódź Zoo and the city's botanical garden, and together with them it comprises an extensive green complex known as serving the recreational needs of the city. Another notable park located in Łódź is the Józef Poniatowski Park. The Jewish Cemetery at Bracka Street, one of the largest of its kind in Europe, was established in 1892. After the invasion of Poland by Nazi Germany in 1939, this cemetery became a part of Łódź's eastern territory known as the enclosed Łódź ghetto (Ghetto Field). Between 1940 and 1944, approximately 43,000 burials took place within the grounds of this rounded-up cemetery. In 1956, a monument by Muszko in memory of the victims of the Łódź Ghetto was erected at the cemetery. It features a smooth obelisk, a menorah, and a broken oak tree with leaves stemming from the tree (symbolizing death, especially death at a young age). the cemetery has an area of . It contains approximately 180,000 graves, approximately 65,000 labelled tombstones, ohels and mausoleums. Many of these monuments have significant architectural value; 100 of these have been declared historical monuments and have been in various stages of restoration. The mausoleum of Izrael and Eleanora Poznański is perhaps the largest Jewish tombstone in the world and the only one decorated with mosaics. Economy and infrastructure Before 1990, the economy of Łódź was heavily reliant on the textile industry, which had developed in the city in the nineteenth century owing to the abundance of rivers used to power the industry's fulling mills, bleaching plants and other machinery. Because of the growth in this industry, the city has sometimes been called the "Polish Manchester" and the "lingerie capital of Poland". As a result, Łódź grew from a population of 13,000 in 1840 to over 500,000 in 1913. By the time right before World War I Łódź had become one of the most densely populated industrial cities in the world, with 13,280 inhabitants per km2, and also one of the most polluted. The textile industry declined dramatically in 1990 and