The complex is located at the entrance to the town of Guardabosone and includes three distinct bodies an ancient votive pylon with frescoes by Tomaso Cgnolis and Gaspare da Ponderano built at the end of the 14th century a chapel from the beginning of the 17th century has an octagonal plan and is built around the bin and a Latin-plan church built between 1660 and 1679.
inside notable artistic works with refined stuccoes.
the church was built by Don Antonio Traversino, parish priest of Guardabosone from 1657 to 1705 and entrusted to Carlo Rocco Gilardi from Campertogno, a little genius with qualifications as a designer, plasterer, plasterer and wall master. the baroque sanctuary is dedicated to the Blessed Virgin Annunziata but popularly known as "Madonna del Carretto", being on the only cobbled road that then connected the Biella area and Valsessera with Valsesia (see photo).
The octagonal aedicule, richly decorated with baroque motifs inspired by the Spanish literary philosophy of Luis de Góngora, is declared a National Monument due to its stylistic rarity.
Popular tradition refers the construction of the chapel to an important bequest in memory of the castellan of Milan Don Sanccho de Luna y de Rosas, who fell in combat in these places on 31 January 1617.