Daisen Kofun is one of the largest burial mounds in Japan, located in Osaka Prefecture. Built during the 5th century, it is part of a group of ancient tombs known as Kofun, which were constructed for powerful leaders. The mound is shaped like a keyhole and measures about 486 meters in length, making it a significant historical site. The tomb is believed to be the final resting place of Nintoku, a legendary emperor of Japan. Surrounded by a moat and lush greenery, Daisen Kofun is a UNESCO World Heritage Site, attracting visitors interested in Japan's ancient history and culture.