Airports take up a lot of real estate and were often built right next to the city almost 100 years ago. Over the years, cities have grown and enclosed the airport, limiting the expansion of the airport. Eventually, a new, larger airport will be built outside of the city, and the old airport will be abandoned. This can free up a huge amount of real estate that can then be transformed into a city park. For example, China’s Shanghai Longhua Airport has been partially transformed into a city park. Here are five former airports that are now city parks around the world.