Sljeme is the top of Medvednica , a mountain above Zagreb . It is located at 1033 meters above sea level . An asphalt road leads to Sljeme, numerous hiking trails, and from 1963 to 2007 the Sljeme cable car was in operation.  Sljeme is one of the favorite picnic spots in Zagreb. On Sljeme there is a ski slope which is one of the locations for the World Ski Cup ( Snow Queen ) races. At the very top is the RTV tower , 169 meters high, built in 1973 .