Daisen Park
Sakai City's urban park is adjacent to the Nintoku-tennō-ryō tumulus (Daisen tumulus), which has been designated a World Heritage Site. The vast park of 380,000 m2 is filled with greenery and seasonal flowers and is dotted with large and small tumulus, including the Osamezuka tumulus and the Magodayuyama tumulus.
Daisen Park has been selected as one of Japan's Top 100 Urban Parks and Top 100 Historic Parks. It's definitely worth a visit if you're in the area.