The Castle of Galeras, also known as Fuerte de Galeras, is an 18th-century military fortress built between the mid-1700s and 1777 on a mountain near Cartagena, Spain, under the direction of Croatian military engineer Mateo Wodopich. Designed by Pedro Martín-Paredes Cermeño in Neoclassical style, the quadrangular fort was strategically positioned to guard the Military Arsenal of Cartagena and connected to the city walls. The fortress saw significant military action during the Peninsular War (1808–1814) and the Cantonal Revolution (1873–74), gradually diminishing in military importance but serving as a military prison in the 20th century. Declared a Cultural Interest monument, the castle is now exclusively reserved for Spanish Navy use and is not open to public visitors.