Encyclopedia Britannica
http://www.britannica.com/
Library of Congress
http://www.loc.gov/
Books to Read Aloud
http://www.scholastic.com/100BestReadAloudBooks/
National Gallery of Art for Kids
https://www.nga.gov/education/kids.html
Book Lists By Scholastic
https://www.scholastic.com/parents/books-and-reading.html