Currently, the building, made of sandstone (while the valley is limestone), has a rectangular floor plan. It features a single nave with a semicircular apse inside and a rectangular one outside. The facade, which was preceded by a portico (built in the 1950s and destroyed in the arson of ’79), has a simple portal flanked by two small rectangular windows framed in white stone. Photographs from before the 1955 restoration document the existence of a central circular opening (a rose window?) on the facade, now disappeared. Inside, according to oral testimonies, the remains of a choir loft above the entrance door were visible. The lintel bears the date 1647 and the initials of Jesus and Mary (16 IHS MRA 47). At the top of the facade is the bell gable with a bifora window, made of limestone. Both sides of the building have two small rectangular windows framed in limestone. Description: Painting of the mother with child on a metal plate in a Baroque frame. On the back of the image, it is written that it was blessed in 1913 by the parish priest of San Antonio in Bosco (Borst), to replace a previous image that had been stolen. The image was carried in procession from the church of Bagnoli / Boljunec to the chapel on Easter Monday. It remained in the sanctuary until the first Sunday of October (Our Lady of the Rosary) when it was returned to the parish church. Currently, it is permanently kept in the sanctuary, hanging on the wall to the right of the altar. Entered into use: between the year 1913 and the year 1913 Epiphany: Madonna and Child. Image: Painting
Original location of the Sanctuary: Hung on the sanctuary walls. Type of ex-votos: Goldsmithing objects Current preservation: The few specimens that escaped acts of vandalism are kept in a location omitted for security reasons.

According to some clues, its construction may date back to the 9th century, although the first available documentation dates back to the 13th century, when the Confraternity of the Battuti or the Most Holy Sacrament was established in Trieste, which perhaps contributed—at least in part—to the construction of the sanctuary. In a statute of the Confraternity dated 1367, Santa Maria in Siaris (alongside Santa Maria di Grignano) is explicitly mentioned as a place where the brothers had to go in penance, barefoot, in case of blasphemy or dishonorable words. Since the 1300s, pilgrimages from Trieste on May 3 (May Day—Marian month) have also been documented. It is likely that the life of the church is connected to the use of the Rosandra Valley for trade, and thus its importance at an extra-regional level gradually diminished during the 1700s. Oral testimonies attest to occasional processional use until the early 1970s of the 1900s.
The village had begun to erect a church in a point of the Rosandra Valley (according to some, where the remains of a building believed to be an ancient chapel now stand). The next day, they found that the stones had been moved. It was therefore decided to build the sanctuary at the indicated point (oral tradition). The parish priest of Bagnoli reports that according to some, the church was built by the will of Charlemagne.
In the 1600s, the parish of San Dorligo was under the jurisdiction of San Servolo, subject to tithes to the Bishopric and part of the Province of Cragno.
It was probably under the care of the Confraternity of the Most Holy Sacrament, established on June 9, 1635, at the parish church of San Ulderico (San Dorligo / Dolina), but there is no certain data on this. Similarly, the existence of a nearby convent, traditionally called the “white friars,” which might have had a role in the care of the sanctuary, remains purely hypothetical. Currently, spiritual care is entrusted to the parish, assisted by volunteer groups.
In the Prospectus beneficiorum ecclesiasticorum (at least since 1870), it is mentioned as under Imperial Royal patronage; over the last two centuries at least, the management of the church’s assets in Bagnoli / Boljunec was entrusted to a committee of 4 members (two proposed by the parish priest and two elected by the srenja, vicinìa, local community represented by the heads of households) who controlled and kept accounts, decided the salary of the priest and bell-ringer, and set the fees each villager had to pay for worship. The fees for the parish priest were collected for the last time in 1968.

Location S. Antonio In Bosco, 93, 34018 San Dorligo della Valle TS, Italy