The Trinity-Elias Monastery on Boldina Hill is the largest monastic complex in Chernihiv — a 17th-century baroque ensemble of churches, bell towers, and monastic buildings that crowns the same hill as the Black Grave burial mound, giving the park a strange double character of medieval Christianity and pre-Christian memory.
The complex consists of the main Trinity Cathedral (1679–1695), built in Ukrainian baroque style with characteristic white stucco ornament on green walls, and the older Elias Church, which incorporates a cave church dug into the hillside. The cave church — small, low-ceilinged, and lit by candles — can be visited on guided tours. The monastery is still active and houses a monastic community; the grounds are open to visitors. From the hilltop there are good views over the Desna river floodplain to the north.