The Vienna Prater is both a huge outdoor area and an amusement park. Once the Emperor Maximilian II's hunting ground in the 16th century, in 1766 Emperor Joseph II declared it open parkland for everyone. Coffee-houses and cafes sprang up and nobody seemed worried that it continued to be used for hunting until 1920! It was also around the 18th century that the Wurstelprater began - an amusement park which continues to this day and includes the giant ferris wheel, the Riesenrad, one of Vienna's famous sights. There are also bumper cars, a roller-coaster, and carousels.
The Prater also houses a planetarium and the Prater Museum, a little disappointing as museums go although the antique slot machines are worthwhile.