Heguilou, also known as the foot of the hill, is located in Pushan Village, Meilin Town, Nanjing County. It is the tallest earth building in Nanjing. This earth building is built on marshland, piling and paving with more than 200 pine trees. After more than 200 years, it is still stable and well preserved. And your building is five stories high, 21.5 meters, don't underestimate this figure, it is "the world's largest", this is a surprise. If you stomp your foot in the patio, the whole pebble in the patio will ripple and shake. This is the second wonder. And Guilou's third wonder, that is, two wells in the middle of the building, 18 meters apart, the water level of the well is higher than the ground. The left one is as bright as a mirror, and the water quality is sweet. Several red carp swim in the well, like elves, while the right one is turbid, yellow, dirty and completely unable to drink.