Milanese Art Nouveau style combined with elements of neo-Romanesque and Gothic revival architecture, regarded as one of the last such types of architecture in the city. A new, more eclectic form of architecture can be seen in buildings such as Castello Cova, built the 1910s in a distinctly neo-medieval style, evoking the architectural trends of the past. An important example of Art Deco, which blended such styles with Fascist architecture, is the huge Central railway station inaugurated in 1931. The post–World War II period saw rapid reconstruction and fast economic growth, accompanied by a nearly two-fold increase in population. In the 1950s and 1960s, a strong demand for new residential and commercial areas drove to extreme urban expansion, that has produced some of the major milestones in the city's architectural history, including Gio Ponti's Pirelli Tower (1956–60), Velasca Tower (1956–58), and the creation of brand new residential satellite towns, as well as huge amounts of low quality public housings. In recent years, de-industrialization, urban decay and gentrification led to a vast urban renewal of former industrial areas, that have been transformed into modern residential and financial districts, notably Porta Nuova in downtown Milan and FieraMilano in the suburb of Rho. In addition, the old exhibition area is being completely reshaped according to the Citylife regeneration project, featuring residencial areas, museums, an urban park and three skyscrapers designed by international architects, and after whom they are named: the Isozaki Arata—when completed, the tallest building in Italy, the twisted Hadid Tower, and the curved Libeskind Tower. Parks and gardens The largest parks in the central area of Milan are Sempione Park, at the north-western edge, and Montanelli Gardens, situated northeast of the city. English-style Sempione Park, built in 1890, contains a Napoleonic Arena, the Milan City Aquarium, a steel lattice panoramic tower, an art exhibition centre, a Japanese garden and a public library. The Montanelli gardens, created in the 18th century, hosts the Natural History Museum of Milan and a planetarium. Slightly away from the city centre, heading east, Forlanini Park is characterised by a large pond and a few preserved shacks which remind of the area's agricultural past. In recent years Milan's authorities pledged to develop its green areas: they planned to create twenty new urban parks and extend the already existing ones, and announced plans to plant three million trees by 2030. In addition, even though Milan is located in