cave paintings and petroglyphs in tassili najjer national park, algeria

abstract acacus africa ajjer akakus alcove algeria algerie amazing animals architecture arid art berdj bovid carving cave cavern colorful crying desert djanet dry heritage historical human illizi image landmark man najjer national outdoor painting paintings parietal park pattern petroglyph petroglyphs prehistoric primitive rock sahara stone tadrart tassili texture unesco wall