The Palm House defines the northwestern edge of Burggarten. Originally called Kaisergarten (Emperor’s Garden), the 9.5 acres were designed by royal gardener Franz Antoine the Elder in 1818. The imperial family enjoyed the botanical solitude for a century before Burggarten opened to the public. The park contains several interesting statues including those of Francis I (Holy Roman Emperor 1745 – 1765), Franz Joseph I (Emperor of Austria 1848 – 1916) and composer Wolfgang Mozart (1756 – 1791). The most interesting artworks are the putti sculptures lining the Neue Burg Wing terrace. Versions of these sweet chubby children plus cherubs can be found playing on building facades and monuments throughout Vienna.