bulak cave in safranbolu.

quail formation geology rock cave red wadi canyon badlands arch terrain soil cliff temple wood caving carving painting wall bulak safranbolu length 400 meters open visitors natural wonder stalagmites stalactites travertines ponds underground water source background abstract water travel nature landscape light wall interior wallpaper old turkey stone beautiful natural rock tourism geology mineral rocky cave geological tunnel ancient underground cavern stalagmite landmark caving geologic safranbolu karabuk mencilis ma?aras? inside ma?ara mencilis dark national karabük