The Kofun tombs, preserved for over 1,600 years, are now surrounded by modern-day Osaka.

The colossal keyhole-shaped Daisen Kofun is specifically oriented toward the sunrise at the winter solstice.

It is one of the three largest ancient tombs in the world, alongside the Great Pyramid of Giza in Egypt and the Mausoleum of the First Qin Emperor in China.