Visitors view "Letter to Boyuan", a piece of calligraphy by 4th-century calligrapher Wang Xun, at an exhibition showcasing China's achievements in cultural relic retrieval at the National Museum of China in Beijing, capital of China, Sept. 17, 2019. More than 600 valuable cultural relics are on display at the exhibition, symbolizing the country's arduous yet fruitful journey of cultural relic retrieval over the last seven decades. Divided into four sections, the exhibition unfolds 25 stories of how the relics and artifacts were brought home. (Xinhua/Li He)