The Aklis Archeological Site, a prehistoric shell midden on the coast, is in the refuge. The 4-acre (1.6 ha) site dates back to the year 400 and show evidence of human occupation for over 200 years, and has yielded a wide variety of artifacts, including pottery and stone tool fragments, and human remains. The site is subject to gradual erosion.[1] It was listed on the National Register of Historic Places in 1976.