Readers of all ages flocked to the National Mall in Washington, D.C., this past weekend for the 12th annual National Book Festival, organized by the Library of Congress. More than 60 children's book authors and illustrators participated in the two-day festival, which regularly draws more than 100,000 visitors. Young readers could listen to presentations from the likes of Marc Brown and Judy Sierra, Amy Krouse Rosenthal, and Peter Reynolds, while Jeff Kinney, Christopher Paolini, Lois Lowry, Walter Dean Myers, Melissa Marr, and many others drew crowds of older children and teens. If you couldn't make it this year, take a visual tour of the festivities with our photo-essay.