There are few pictures of Big Seven Holes. We went to Little Seven Holes on the first day and went to Big Seven Holes on the second day when we thought about it. Why did the pictures go so little before we found the depression that the effect of watching the shocks was not good? It's a flat way to get in. Along the river, the boat can only go half way, and the back can only be used. Only open to the demon wind tunnel, then intercepted in the back, observed, has been closed for a long time, peeping into the scenery should be quite attractive, do not know what the reason, intuition is regrettable. After getting off the boat, we walked in this section, along the trestle road with strange stones and staggered stone milk and tree roots. When Tianshengqiao was really shocked, we carefully watched it for half a day. It was naturally differentiated, thrilling and fantastic. Intuitionistic strange stones had transpired away like green water, and the mountain breeze was feathering and rising like a slit in the cave. Then winding upward, only two or three bends, a stone bridge, several local vendors, and a few steps to the demon wind tunnel, suddenly found that the green water has become blue, deep out of the low cave, unfortunately, the trestle road was robbed in vain, can not go inside. Standing on your feet and looking in, mysterious and unpredictable... Summary: The original ecology and mystery will last 30 minutes, which is quite different from the small seven holes.