The Torre de El Encinal is located on the outskirts of the town of Nanclares de la Oca. The Carlist Wars, III Carlist War (1875), have left the remains of three towers in their path through Iruña de Oca that, located on two heights, have guarded this strategic point for years.
The Elizabethan troops built them to maintain communication by road, due to the harassment that the Carlists carried out on their convoys, within a line of government fortifications that secured the Miranda de Ebro-Vitoria route from the Carlist attacks. It was abandoned shortly after, at the end of the war in February 1876 and its ruin began, until it was restored at the end of the 20th century.
It is located on the Encinal hill immediately to the town, it controls the accesses from the southern slope of the Sierra de Badaya. With identical structure to the Torre de Almoreta, it has a floor area of about 94 m² and, after the restoration of the facade throughout 1997, it was inaugurated in July of that same year as an exhibition hall.
The tower is quadrangular, and has chamfered corners. Outwardly it has a compact shape, two heights and with a crenellated crown. On the ground floor there is a loophole on each corner, five loopholes on three of the facades and a door with two loopholes on each side on the fourth side. On the upper floor there are five loopholes on three of the facades and on the fourth a central French door, flanked by a loophole on each side, in addition to one on each corner. It presents a very good state of conservation, having been recently restored.