Oud Haerlem Castle

Oud Haerlem Castle are the remains of a fortified structure in Heemskerk with foundations revealing a square layout from medieval times. The ruins spread across a substantial area, allowing visitors to grasp the scale and organization of this military stronghold.

The fortress was founded in the 13th century and remained a significant stronghold for over a century. It was ultimately destroyed during a major regional conflict that reshaped power in the area.

The castle served as a focal point for the local community and its remains reflect how medieval fortifications shaped life in this region. Walking through the site helps visitors understand how such structures defined the landscape and influenced settlement patterns of their time.

The site is located near another castle and is accessible on foot through a residential area. Visitors should be mindful that they are walking through an archaeological site and should treat it with care.

Excavations in the mid-20th century uncovered valuable metal treasures that reveal medieval craftsmanship and trade. Modern ground studies later revealed an ingenious moat system that made approaching the fortress difficult and required navigating multiple water barriers.