The image shows the entrance of a building with a wooden roof and a sign that reads "Nagasaki Wind Cave Cold Storage - Natural Refrigerator". The entrance has a large glass door with a metal frame and a metal grate at the bottom. The door is flanked by two wooden pillars on either side. On the left side of the door, there is a sign with Japanese text and a picture of a wind turbine. The sign is located on the wall of the building and appears to be warning people not to enter the cave. The background is filled with rocks and debris, suggesting that the entrance is located in a natural environment.