Visit this oasis of peace which used to belong to the Habsburg family. Although not very big, this garden is full of marvellous statues and if you have enough of strolling around, you can explore Butterfly House or Palm House, which are also located in this park.
Wikipedia (German) https://de.wikipedia.org/wiki/Burggarten_(Wien)
Official Website https://www.bundesgaerten.at/hofburggaerten/Burggarten.html
Address Josefsplatz 1, 1010 Wien, Austria
Coordinates 48°12'15.501" N 16°21'57.007" E