In pics: U.S. Library of Congress in Washington D.C.

People visit the Thomas Jefferson Building of the U.S. Library of Congress in Washington D.C, the United States, on Aug. 10, 2018. Founded in 1800, the Library of Congress is the oldest federal cultural institution in the United States and the largest library in the world. It has more than 167 million items, including books, recordings, photographs, maps and manuscripts. (Xinhua/Liu Jie)