A few days ago, I visited Asuka mura and stopped by this gigantic structure, quiet a feat considering it was constructed in the beginning of the 7th century.
Ishibutai Kofun (石舞台古墳) is a stone kofun tumulus of the Asuka period in the east of Shimanoshō, Asuka, Nara Prefecture, Japan. The kofun is believed to be the tomb of Soga no Umako (蘇我 馬子). It occupies a space of 54 m (177 ft), and is the largest known megalithic structure in Japan.
Here is how they did it: 1. Sand was taken away a little at a time from the right side of the stone while balancing it using weights buoying the giant stone. 2. The heavy stone was carried using levers, rollers, wheels and pulleys. 3. A whole was filled with dirt while gradually moving the stone upright. 4. To complete the tomb, the ceiling stone was set, then dirt was removed from the inside. The tomb was then covered by dirt and holes were tunneled and the top was covered by small stones.