Close to Brtonigla , by Stancija Druš ković , after the nearly vertical steps , stands the entrance to one of the largest underground halls in Istria . The cave is rich in different coloured dripstones , stalagmites that are as much as 13 meters tall making Mramornica particularly fascinating and attractive .
Nedaleko Brtonigle , kod Stancije Drušković , nalazi se , nakon gotovo okomitih stuba , ulaz u jednu od najvećih podzemnih dvorana u Istri bogatu sigama raznih boja , stalagmitima visokim i do trinaest metara koji Mramornici daju posebnu čar .