Here are some ideas: a definite must is the old world style of Winnie the Pooh’s original illustrations and Alice in Wonderland, and Through the Looking glass.
A great picture book is the wordless, but very moving The Angel and the Soldier Boy. Besides Spot the dog, there are the great little picture books of Clifford the Big Red Dog, and Jillian Jiggs [a girl with a hilariously messy room and great illlustrations], the sweet little mouse Frederick the poet, the big, adorable, neat picture book The Golden Egg and the little picture book about Little Black Sambo, who outsmarts tigers and has pancakes with his mom and dad [he's from India in my version/copy of the book].
As a kid my only cookbook was a cookie one, the Alpha-Bakery Gold Medal Children’s Cookbook. Each letter has a recipe and it has very cute illustrations. I still love it.
For young people: From the Mixed-Up Files of Mrs. Basil E. Frankweiler. What an introduction to the Renaissance, museums, the ancient world, sculpting, art and life, I loved it once I realized where it was going--and even then it always surprised me. Also look into Redwall for mystery and adventure lovers, Nancy Drew, and The Egypt Game [which for lovers of history, art, mystery and Egypt is more loved than the more famous The Westing Game].