In the northwest of Dulan Village, there is a mild marine terrace where well-preserved stone coffins and stone walls are found, now classified a third grade historical site. During the Japanese ruling (1895-1945), a rectangle stony coffin was excavated here. Follow-up investigations later by Academia Sinica led to discovery of giant stone piles. The site and the objects date back to 3,000 years ago and are believed to be a part of Kirin Culture. Now considered a protected cultural heritage, the site is divided into stony coffin area and stony wall area. Footways and explanatory signs are available. It is believed that more historical sites are nearby and await excavation here.