Huisduinen was the original older part of the city, whereas Helder itself was a nearby smaller hamlet. Due to its strategic location at the tip of the North Holland peninsula, multiple fortifications were built in the area. The area likely began being called Helledore ("Hell's Door" or "Hell's Gate", later on Den Helsdeur) because of the "hellish" fortifications that prevented enemy ships from sailing into the Zuyderzee. The name Helder may also have come from Helle/Helde, which means hill or hilly grounds, or from Helre, which means a sandy ridge.
Den Helder has played an important part in Dutch shipping. During the Dutch Golden Age, ships would be assembled near Den Helder and sail from there the world's oceans. During the 1820s, the North Holland Canal was dug from Amsterdam to Den Helder. The lighthouse Lange Jaap was built in 1877 and is the tallest cast-iron lighthouse in Europe, at 63.45 meters (208.2 ft)
