D15 is one of the more complete hunebedden, with a mostly intact ring and entrance portal, and commands a vista of open fields outside the small village of Loon. Little is known of the site's pre-neolithic history, but many finds here from the Bellbeaker culture, the Bronze age and even into the 6th century AD indicate the site was in use for a long time afterward it was built in the neolithic. The well-formed oval ring is made up of relatively large stones, and it still had most of its earthen covering in 1870 when it was excavated.