Rock Center of Little Gellért Hill
The Rock Center or just Rock ( or "Szikla" ) , more precisely the Rock Center of Little Gellért Hill , originally known as the Citadel ( "Fellegvár" ) , is a mostly subterranean military complex in the 11th district ( Újbuda ) of Budapest , Hungary . 
<triplet> Rock Center of Little Gellért Hill <subj> Hungary <obj> country <triplet> 11th district <subj> Budapest <obj> located in the administrative territorial entity <subj> Hungary <obj> country <triplet> Budapest <subj> Hungary <obj> country <triplet> Hungary <subj> Budapest <obj> contains administrative territorial entity