Trinidad de Arre, Romanesque basilica in Arre, Navarra, Spain

Trinidad de Arre is a rural Romanesque basilica from the first half of the 13th century, with a single nave in three sections under a barrel vault and a semicircular apse. Buttresses and two splayed round-arched windows show on the apse, the only visible part of the Romanesque exterior; 19th-century buildings adjoin it, and the tower at its foot is raised in brick.

This sanctuary developed during the Middle Ages as a crucial stop for pilgrims on the Way of Saint James, originally featuring a hospital for weary travelers. The Romanesque style of its construction reflects the period when it served this important pilgrimage function.

The name comes from the shrine's dedication to the Holy Trinity, a devotion still rooted in the Pamplona basin through the healing properties traditionally attributed to it. Two brotherhoods, one lay and one ecclesiastical, ran the basilica and the hospital; the ecclesiastical one had 626 members in 1575, and both merged in 1886. The Marist Brothers now maintain the basilica, bridge and hostel.

The site is accessed across a six-arch stone bridge spanning the Ultzama River, which provides a pleasant entrance to the grounds. The location sits in open terrain where it is easy to find and approach from the surrounding walking paths.

The basilica retains original Romanesque features including barrel vaults that showcase the building techniques from its medieval construction period. These original elements give visitors a direct sense of how pilgrim churches appeared centuries ago.