Schönbrunn Palace is Vienna’s answer to Versailles and was used as the summer residence of the Habsburgs from the 18th century until 1918. Of the 1,441 rooms in the palace and its adjacent buildings, 40 state rooms are open to the public. The golden-yellow palace is set within equally magnificent gardens, landscaped in the baroque style, with some fabulous views. The palace and gardens are included in the UNESCO World Heritage Site list. The Gloriette is a triumphal arch that stands on the hilltop behind the palace and affords a stunning view over the grounds and the city beyond. The Palmenhaus (Palm House) is an excellent example of late 19th-century architecture, with cast iron columns delicately holding up the glass walls and roof. The world’s oldest zoo (from 1752) can be found in the park too.