The Saint-Jean chapel is not only the smallest of the region's half-timbered religious buildings, but also one of the oldest, built between 1484 and 1504. Originally, it was the chapel of a leper colony, before becoming a simple sanctuary of devotion around the 17th century. One of its particularities lies in the shape of the armpits of the porch, which form three trilobed arches. Framing the door, the two large rectangular bays decorated with wooden bars allowed lepers, who remained outside, to follow the services. This building is closed to the public. It is possible to visit it during the guided tours of Soulaines-Dhuys offered by the Tourist Office in July and August (Wednesday afternoon).