The monastery of the Russ­ian Ortho­dox Church was found­ed by Sergius of Radonezh in 1337. The com­plex con­tains more than 50 thou­sand build­ings from the 15th to 19th cen­turies. Among them, the Holy Trin­i­ty Cathe­dral stands out, where the relics of the saint are kept and you can see the fres­coes of Andrei Rublev. The tomb of Boris Godunov is hid­den in the Assump­tion Cathe­dral.