One of the most iconic landmarks of Kiev is Saint Sophia's Cathedral. This stunning UNESCO World Heritage site was built in the 11th century and features beautiful architectural details, intricate mosaics, and impressive frescoes. The cathedral is a symbol of Kiev's rich history and cultural heritage, and it remains an important spiritual and cultural center for Ukrainians. Visitors can explore the interior of the cathedral, climb to the top of its bell tower for panoramic views of the city, and stroll through the neighboring Saint Sophia's Square. Saint Sophia's Cathedral is a must-see attraction for anyone visiting Kiev.