Four kilometres from the coast, just before the mouth of Limfjord meets the North Sea, the Rammedige dike was built as an Iron Age place of refuge. The complex was probably still in use during the Viking Age, as has been seen in other places, such as Bornholm, Lolland and Falster. Two excavated burial mounds in the immediate vicinity, which date back to the Viking era, confirm this assumption. The dike is 2.5km long and is oriented in a north-south direction. The moat is placed on the eastern side of the dike, so those who built it clearly expected the enemy to come from the land side. Parts of the original earthworks have been preserved, while others has been reconstructed, giving visitors a very good impression of what the original structure was like. The entire construction crossed an ancient road south of Limfjord, which can still be discerned today along the many preserved burial mounds. There were originally around 60 burial mounds at Rammedige, but today only 15 remain. A legend says that the dike was constructed as protection against the English king Angel, and that all those who fell in a battle against him are buried in the mounds around the complex. There are info-panels at the site.