Jedna od najvećih spilja u Istri, spilja Mramornica, predstavlja pravi dragulj istarskog podzemlja. Mramornica se spominje davne 1770. godine kada ju je posjetio i opisao poznati putopisac Alberto Fortis. 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. S uređenih spiljskih staza pogled se širi na nedostupne dijelove jame koji svojom tajnovitošću postaju još primamljivijima.

One of the largest caves in Istria, caves Mramornica is a true gem of the Istrian underground. Mramornica mentioned back in 1770th when it was visited and described by the famous travel writer Alberto Fortis. Near Brtonigla, the Homesteads Druskovic, there is, after nearly vertical stairs, entrance into one of the largest underground room in Istria various colors rich stalactites, stalagmites high and up to thirteen feet Mramornica to give a special charm. With groomed trails cave look to expand in inaccessible parts of the cave whose secrecy becomes more inviting.