The Church of the Holy Trinity, built in 1551 from larch, is a unique monument of Russian wooden architecture of the 16th century on the right bank of the Volga. It is the only surviving structure from the fortress of Ivan the Terrible, brought down the Volga from Myshkin. The church was erected in the shape of a cross and consists of two tiers: the first, quadrangular with a semicircle for the altar, and the second, octagonal. The dimensions of the church are 10 by 4 sazhen.

In the winter of 1550, the church was cut down in the forests near Uglich from thick larch logs and delivered to Sviyazhsk in the spring of 1551, where it was installed in one day by the warriors of Prince Serebryany-Obolensky. The church is 163 years older than the Transfiguration Church in Kizhi and was consecrated on May 17, 1551, on the day of the Holy Trinity.

In the 17th century, the church underwent significant changes when the Ioanno-Predtechensky Monastery was established on the grounds of the closed Trinity-Sergius Monastery. In 1819, porticos with columns were added to the church, and in 1821, it was placed on a brick base, covered with planking, and painted with oil paint. During the Soviet era, the interior was significantly altered, icons from the 16th and 17th centuries were removed, but the structure of the iconostasis was preserved.

In the 19th century, the church underwent significant changes: the tent roof was replaced with a flat iron roof, making it lower. The log structure was completely covered with planking and painted in various colors. However, the church has now been returned to its original appearance.

The interior of the church resembles a village hut: along the walls are long benches nailed to the floor, even in the altar. Everything in the church is made of wood, including the seven-branched candlestick. The only standout feature is the darkened copper chandelier. The main decoration was a wooden iconostasis in the style of Ukrainian baroque, partially preserved. At the entrance to the church, there is a bench where, according to legend, Ivan the Terrible sat.

To this day, the church has preserved a 17th-century iconostasis, although in a damaged state, lacking many details of carving. Wooden sculptures of the Savior and the apostles, as well as icons of the festive order, which are of special value, were transported to the Kazan Museum of Fine Arts.