The 500-meter-long Jiutian Cave in Yiyuan of Shandong province is known as a karst cave museum with wonderful in-cave scenes.

Over millions of years, dripping water has eroded the cave into a special world of various enchanting stalactites and stone pillars.

In late autumn, Lushan Mountain, where the cave nestles, is covered with bright red maple leaves, attracting visitors to the fairytale world.

There are about one hundred such caves in Yiyuan, regarded as the largest karst cave cluster in terms of scale in Northern China.