A vast cluster of ancient burial mounds (kofun) located in Sakai, south of Osaka. The most iconic is the Daisen Kofun, believed to be the tomb of Emperor Nintoku and shaped like a massive keyhole — one of the largest tombs in the world. Now a UNESCO World Heritage Site, the area includes several kofun, best appreciated from nearby viewing platforms, walking trails, or by cycling around the site.

💴 Entry fee: Free (surrounding paths are open to the public)

🎯 Touristy?: Not very touristy. Mostly visited by history and culture enthusiasts — still a hidden gem for most travelers.