The Huis ter Kleef castle was probably built in the late 13th century. In 1403 it was given to Margaret of Cleves (c.1375-1411), and has since retained that name. During the Siege of Haarlem in 1572 it was the headquarters of the Spanish army, under the leadership of the duke of Alva. It was blown up in 1573 and badly damaged, the rubble was used for city expansion. The house nearby with a tower called the 'Kaatsbaan' was long considered the only building left standing, though recent archeological research suggests that the foundations have older stones than the rest and perhaps it was itself rebuilt after the explosion.
The property changed hands several times until it was purchased by the city of Haarlem in 1713. Stones from the central castle ruin can still be seen in surrounding buildings. The Kaatsbaan was used as a residence for former owners and is now also in use by the city gardens.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.