The Trinity Lavra of St. Sergius is the most important monastery in Russia and the spiritual headquarters of the Russian Orthodox Church. Enclosed within tall white walls studded with towers, the complex is a dense ensemble of churches, cathedrals, chapels, bell towers, and monastic buildings accumulated over six centuries of construction. It was designated a UNESCO World Heritage Site in 1993.
The monastery was founded around 1345 by St. Sergius of Radonezh, a monk who withdrew to this forested hilltop to live in solitude. His reputation for holiness drew followers, and the community grew steadily. The five-domed Assumption Cathedral (1559–1585), its domes painted deep blue with gold stars, dominates the complex visually. The older Trinity Cathedral (1422–1423) contains the tomb of St. Sergius and is covered internally with frescoes partly attributed to Andrei Rublev. The 18th-century bell tower rises 88 metres and houses a 65-tonne bell cast in 1748. Dress codes are strictly enforced: men must remove hats, women must cover their heads and not wear shorts or short skirts.