En uno de sus valles recorrido por el río Iregua, está el Camero Nuevo, tierra de bosques, pastizales, cumbres y pequeños valles, donde se sitúan 13 pueblos con historia, tradiciones y leyendas, que siglos atrás se agruparon bajo la denominación de Hermandad de las 13 Villas.
It has a lean tower dating from 1764, turned into a permanent watch tower for the town, and an atrium and arcades that have witnessed an important activity since ancient times.
It is a quadrangular construction of the XVI century, raised in ashlar stone, with three naves and starred vaults. It houses a series of images and altarpieces, including the central altarpiece devoted to Saint Martin (from 1543), a Flemish triptych (from 1575), a Renaissance altarpiece presided over by a Gothic carving of the Virgin and a large collection of XVIII century images.