Architectural introduction: The second entrance is the main building of Mengxi Garden, which is a Qing-style hall, facing south, with ancient wooden lattice flower doors and windows facing south. The entire hall is arranged as an exhibition room for Shen Kuo's scientific research achievements, which contains Shen Kuo's portraits, text pictures, models, objects, etc., displaying Shen Kuo's achievements in astronomy, geography, mathematics, chemistry, physics, biology, geology, medicine, etc. Research results.