Aisa parish church was built in the 18th century, probably on top of a previous construction. The design of its structure is based on the Latin cross and has a single nave, chapels between the buttresses and a choir gallery at the western end.

The nave is covered by a barrel vault with lunettes. There is an octagonal dome above the transept which is divided into eight sections separated by ribs that descend to corbels with floral decorations.

The interior has a number of pieces of great value and interest. The altarpieces were made in the second half of the 18th century, the foremost being the altarpiece of the Virgin of the Assumption. It is unusual in that the supports are in the shape of inverted pyramids. The statue of the Virgin is of excellent quality and occupies the central section of this altarpiece.

Several altarpieces with a similar distribution can be found in the transept. On the south side there is a piece dedicated to the martyred saints with Rococo woodcarvings. The altarpiece on the north side, with leaf reliefs, is presided by an image of St Francis of Assisi. The altarpiece of the Virgen of the Rosary stands out for its simplicity and lacks any purely decorational element.

The altarpiece of the Pietà, with its ballustraded columns and supports in the shape of a truncated pyramid (stipes) completes the artistic collection of the church of the Assumption in Aisa. The iconography of this piece shows the Virgin with the body of Christ, accompanied by the agitated figures of St John the Evangelist and Mary Magdalen, whose gestures guide the viewer towards the central scene.