Galeras Fort, locally known as Fuerte de Galeras, lies on a mountain next to the city of Cartagena. Plans to fortify this, 219 meter high, mountain date back to the 16th century. Galeras Fort however was built between the mid-18th century and 1777 by the Croatian military engineer Mateo Wodopich. It was designed by the military engineer Pedro Martín-Paredes Cermeño in the style of eclectic Neoclassicism according to the principles of the Frenchified Spanish School. It had to guard the Military Arsenal of Cartagena and was connected to the city walls. It is situated on a mountain between Atalaya Fort to the north and the Fajardo Battery to the south.
The quadrangular fort saw action during both the Peninsular War, between 1808-1814, and the Cantonal Revolution in 1873-74. In the 20th century it gradually lost its military importance but still served as a military prison.
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.