Belvedere Palace U Bahn. It was the swishy summer residence of prince eugene of savoy, a legendary military leader of his time. Belvedere palace is well served by vienna's bus services (route 69a, stopping at quartier belvedere).
From the station, the main entrance of the belvedere palace is 1.2 km (0.75 miles), and you can walk it in 15 minutes. Since im not familiar with the area, i depend on my google map application. A large formal garden surrounded by.