Grotto Calgeron
Grotto Calgeron ( "cave of Calgeron" ) , also known as the GB Trener cave , is a natural cavity that is located near the village of Grigno in Valsugana in Trentino . 
<triplet> Grigno <subj> Trentino <obj> located in the administrative territorial entity <triplet> Trentino <subj> Grigno <obj> contains administrative territorial entity