Horinouchi Kaizuka Park is a flat hill where shells, animal bones, and other food waste were discarded by Jomon people 4,000 years ago. "Kaizuka" means "shell mound." 堀之内貝塚公園

This hill was also the site of a Jomon Period human settlement 2,500 to 4,000 years ago. A number of excavations were made since 1904 and ancient human remains, pottery, etc., have been found. National Historic Site.