Parque del Castillo, Public park on castle hill in Soria, Spain

Parque del Castillo is a public park situated on a hilltop in Soria, featuring walking paths, green areas, and remains of defensive structures overlooking the Duero River valley. The site includes a playground, picnic tables, fountains, and a seasonal library located in the Casa del Ingeniero building.

The site originally held a fortress built by Count Fernán González, which served as a strategic defensive position until its destruction in 1812. Following the fortress's decline, the hilltop was later transformed into public space for the city.

The Monument to the Sacred Heart, created by sculptor Luis Hoyos in 1944, stands where the former Jewish quarter once existed. The statue shapes the park's appearance today and serves as a reminder of the religious and social history of this location.

Access is on foot only: a footbridge by the Iglesia del Espino through the Postiguillo del Espino, stairs linking the old town with the green area, or a raised walkway along the Siete Curvas from the Fuente de la Paciencia. The vehicle road climbs the east face in tight bends. The upper platform holds the 1965 deposit, the old potabilizadora and the Casa del Ingeniero, used as a summer library.

The 1938 water deposits and the neo-Romanesque water treatment plant were built on the hilltop, which left the earlier 1904 deposit on the northern slope unused. The 1965 tank later cut into the inner wall, and its side arches now house the H2O exhibition gallery.