The Church of the Merciful Savior was built in 1712 in the village of Fominskoye, Kostroma region, on the site of an old wooden tent church dedicated to Saint Demetrius of Thessalonica, which was dismantled due to its dilapidation. In 1847, after the construction of a stone church in the village, the wooden church was closed. In 1968, it was moved to a museum and restored according to the designs of architects I. Sh. Shevelev and A. V. Opolovnikov.

This architectural monument is one of the best examples of a cell church. The building consists of four uneven-height cells, including the altar, the square section, the refectory, and the porch, all parts having the same width. The refectory and porch are combined under a common gable roof with a wedge-shaped covering, while the square section is topped with a similar but taller roof. Above the refectory rises an octagonal tent bell tower with an open ringing tier, accessible by a staircase from the vestibule. On the north side of the refectory is the entrance to the undercroft, which increases the height of the building by almost two meters. The roofing is made in two layers of shingles with birch bark in between. The domes on the square section and bell tower are covered with aspen shingles. The church windows are of two types: rectangular in the temple, refectory, and apse, and round in the refectory and porch. The temple, refectory, and porch are hewn from logs "in the round," while the apse and bell tower are made from beams "in the lap." A shield door with a wrought iron lock leads from the porch to the entrance.

The modest decor of the church includes roof finials that emphasize the peaks at the eaves of the bell tower and the roof over the temple's pedestal, as well as two-layer boards and towels that cover their joints.

The rooms on the main floor, porch, refectory, and temple are connected by openings on a single axis. In the northwestern corner of the porch is a staircase to the bell tower. The ceilings of the rooms are covered with shingles on beams, and the floors are wooden. Along the walls, there are built-in benches with ornate legs. A partially preserved iconostasis from the late 18th century features carved royal gates. In front of the iconostasis are choir stalls with folding benches, decorated with carved geometric patterns. The total area of the temple is 106.5 square meters.