meresti cave in varghis gorge, romania, a popular touristic attraction in covasna and harghita counties. tourism, caving

activity adventure attraction cave cavern caving counties covasna dampness dark darkness deep earth europe exploration geology gorge grey harghita hole huge humidity inside journey labyrinth light meresti mountain mysterious mystery natural nature outdoor passage pit popular rock rocky romania rough speleology stone texture tourism touristic transylvania travel tunnel underground varghis