confined to the area around the palace, while a neo-Gothic dairy was built at the other end of the island. Frederick William III and his wife Queen Luise used the palace as a summer residence. From 1818 [...] 1818 Peter Joseph Lenné was commissioned to transform the island into a landscaped garden. Several new buildings were added, including the Palm House (razed by fire in 1880) and Schinkel’s Cavalier House