St. Marx Cemetery is a cemetery in the Landstraße district of Vienna, used from 1784 until 1874. It contains the unmarked grave of the famous composer Wolfgang Amadeus Mozart.
Wikipedia https://en.wikipedia.org/wiki/St._Marx_Cemetery
Official Website https://www.wien.gv.at/umwelt/parks/anlagen/friedhof-st-marx.html
Coordinates 48°10'57.426" N 16°24'7.022" E