In 1972, the unlooted Takamatsuzuka Tomb was found in Asuka, and some details of the discovery were revealed.
Inside the tightly assembled rocks, white lime plasters were pasted, and colored pictures depict the 'Asuka Beauties' of the court as well as constellations.
The funeral chamber was located beneath the round part and comprised a group of megaliths.
Many Kofun have distinctive keyhole-shaped mounds (zenpō-kōen fun ), which are unique to ancient Japan.
The Mozu-Furuichi kofungun or tumulus clusters have been proposed for inscription on the UNESCO World Heritage List, while Ishibutai Kofun is one of a number in Asuka-Fujiwara similarly residing on the Tentative List.) kofun. For example, in the Saki Kofun group, all of the circular parts are facing north, but there is no such formation in the Yanagimoto kofun group.
In 1996 multiple Shūkōbo tombs were found around the Yeongsan River basin, bringing question to whether the square-shaped tombs are of distinctively Japanese origin. Hashihaka Kofun, which was built in the middle of the 3rd century AD, is 280 meters long and 30 meters high.
Its scale is obviously different from previous Yayoi tombs.