The memorial archway is called a merit monument, which records the achievements of the emperor's life. Behind the courtyard is Baoding, which is called the tomb by the people. After the emperor was born, he was buried under it.
Of the thirteen tombs, only the Dingling underground palace has been opened, and the other underground palaces have not been opened, but only a few can go in and visit Baoding.
Like Changling and Zhaoling, you can go in and visit Baoding.