The National Preserve of St. Sophia is a UNESCO World Heritage site located in Ukraine. It is renowned for its stunning architecture and historical significance, showcasing the rich cultural heritage of the Kievan Rus period. The preserve includes the famous St. Sophia Cathedral, which dates back to the 11th century and features beautiful mosaics and frescoes. In addition to the cathedral, the preserve encompasses several other important structures and monuments, making it a vital center for Eastern Orthodox Christianity. Visitors can explore the grounds, learn about the history of the site, and appreciate the artistic achievements of the time.