Tower-palace of Guevara, Medieval tower palace in Barrundia, Spain.

The Guevara Tower-palace is a stone medieval fortification near Barrundia that blends the features of a residential tower, castle, and palace into one structure. The building displays robust construction with elements that reflect both its defensive purpose and residential function.

The structure originated in the medieval period as a residential tower for the Guevara family in the Basque region. It suffered significant damage during the First Carlist War from the forces of Martin Zurbano but was later partially rebuilt.

The Guevara family were Counts of Oñate from the 15th century and heads of the gamboíno faction in Álava, traditionally linked to the Navarrese monarchy. The palace takes its name from this lineage, recorded in the Juntas de Arriaga of 1262, 1291 and 1332. Visits to the ruins are run by the Asociación de Amigos del Castillo de Guevara.

The ruins have been made visitable, and guided visits are run by the Asociación de Amigos del Castillo de Guevara, so arrange a visit through them rather than arriving unannounced. Only the northwest tower and stretches of the western wall were rebuilt in 1964; the other three towers remain in ruins.

The 16th-century Guevara coat of arms above the entrance, flanked by two cyclops holding columns on human heads, was destroyed on the orders of the liberal general Zurbano after the First Carlist War. Only one of the palace's four corner towers has been restored; the others remain ruins where traces of the fireplace and kitchen survive.