biggest tuffa bathtub and one stalactite in stopica cave on slopes of mountain zlatibor in serbia

adventure balkans bathtub bathtubs biggest brook cave cavern caving creek dark destination detail district europe exploration formation geological geology grotto inside interior light mineral mountain nature one potholing rock serbia slopes speleology spelunking stalactite stone stopiaa stopica stream tourism travel trnava tufa tuffa underground vacation visit wall zlatibor