On the eastern edge of the village, the imposing Heilsberg church attracts attention on an elevated site. It is dedicated to St. Boniface, the "Apostle of the Germans". Its size, in relation to the size of the village of Heilsberg, allows conclusions to be drawn about the former importance of the church. In fact, it was a famous and much-visited pilgrimage church in the Middle Ages. A number of carved figures of saints, which must have come from several altars, bear witness to this.

It is noticeable that the church tower faces west and the nave faces east. Both parts of the building belong to different construction phases. The tower is Romanesque in character and probably dates back to the 12th century, making it the oldest part of the entire complex. Originally, there was an apse on the eastern side of the tower and the nave on the western side. When the church was enlarged, the apse was demolished and the nave was moved from the west side to the east side. The pointed arched door on the south side of the tower, on which, according to legend, a horseshoe was struck by Boniface's horse and which can still be seen today, also deserves special attention.

However, the most outstanding testimonies to former splendor are the figures of saints in their original colour scheme. They were created between around 1470 and 1540 by a carving workshop in Saalfeld under the master Hans Gottwald von Lohr, a pupil of Tillman Riemenschneider, who was based in Würzburg. Further figures and a stone inscription plaque were brought to Weimar in 1816 at the instigation of Goethe's Privy Councillor and can still be seen there. The inscription plaque was found in the tower at the time and despite several attempts by high-ranking linguists of the time, the meaning of the text had not yet been recognized. Even Johann Wolfgang von Goethe made efforts in this matter in his office as Privy Councillor at the court in Weimar.

The pulpit and the wooden baptismal font of the church were built in the 18th century. The church bells in the tower consisted of three bells, two of which had to be sacrificed to the war industry. The third remaining bronze bell was cast in Erfurt in 1754 and bears the image of St. Boniface. The church organ comes from the Schulze workshop in Milbitz near Paulinzella and is considered by experts to be "particularly worthy of preservation" and is currently undergoing extensive restoration.

Finally, a stone slab should be mentioned, which is walled into the tower's first floor, albeit upside down. It is the gravestone of "Christoffel von Enzenberg zu Heilsberg". This name can be traced back to the year 1472 in Heilsberg. Christoffel von Enzenberg was a close confidant of the Counts of Gleichen, who repeatedly entrusted him with the execution of legal transactions.