bani aad cave, the second largest cave in the world

cave formation tunnel infrastructure arch caving geology rock canyon terrain stalagmite quail bridge bani aad second largest world located ain faza area state tlemcen algeria its meters depth forming cavities natural roam stone landscape nature underground entrance dark cavern background inside illustration travel ancient beautiful cartoon old vector environment tourism adventure fantasy isolated wall empty deep dungeon design scenery grotto texture stalactite mysterious water limestone prehistoric ground scene darkness place scary floor black horror passage site mineral caves quit