What is the identity of the unusual circular dome at the entrance?

#IndoorDate The Woongjin Baekje History Museum, located near King Muryeong's Tomb, has a unique architectural form that allows you to go down under a huge dome. The exhibition hall built under the relatively cool dome in the area around King Muryeong's Tomb, where it is difficult to walk due to the lack of shade, is perfect for a summer exhibition date. It kindly shows the history of the princesses of the Woongjin era, the achievements of the kings of the time, and related relics through various kiddie art experiences and utilization. I liked it even more because it was a free exhibition. 🙂 . 🔹️Woongjin Baekje History Museum 🚩37 Wangneung-ro, Gongju-si, Chungcheongnam-do