The Holy Trinity-St. Sergius Lavra.

The Architectural Ensemble of the Trinity Sergius Lavra in Sergiev Posad is a historically and spiritually significant Orthodox monastery founded in 1337 by St. Sergius of Radonezh. Recognized as a UNESCO World Heritage site, the Lavra features a blend of traditional Russian and Western European architectural styles, with over 50 notable structures including the Trinity Cathedral and the Assumption Cathedral, the latter mirroring the Kremlin's design. It houses exceptional cultural treasures such as Andrei Rublev's iconic "The Trinity" and relics of St. Sergius. The complex showcases impressive defensive walls, a remnant of its historical military significance. Today, it remains an active monastery and pilgrimage destination, preserving its rich spiritual, historical, and artistic heritage.