The Torres de Quart is one of the two remaining gates of the old Valencia city wall. It was built between 1441 and 1493 to the site of 11th century Moorish gate.
Over the subsequent centuries, the city of València was not placed under siege. While the walls of the city were in disrepair, the towers continued to be anchor points in the defense of the city. In the 17th century, the tower was also being used as a women's prison, with many inmates being prostitutes. In 1808, during the Battle of Valencia in the Peninsular War, cannonballs and bullets from French troops damaged the gate. The holes were preserved during future restorations as a memory of the occasion.
The gate was declared a national monument in 1931. It has undergone several restorations and now serves as a tourist attraction.
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.