It was more difficult than I thought coming up with this list. There are so many great books out there.
On top of that consider the many genres available: historical fiction, science fiction, mystery/thriller, adventure, fantasy, romance, etc.
Picking the children's books was difficult too. After all books for a four-year-old would certainly not be appropriate for a ten-year-old.
Nevertheless--and for what it's worth--here's the list.
How many have you read?
Children’s Books (Adults would enjoy these too)
The Wind in the Willows by Kenneth Grahame
Charlotte’s Web by E.B. White
Winnie the pooh by A.A. Milne
Where the Wild Things Are by Maurice Sendak
The Cat in the Hat by Dr. Seuss
Animal Farm by George Orwell
Catch 22 by Joseph Heller
The Grapes of Wrath by John Steinbeck
Heart of Darkness by Joseph Conrad
Huckleberry Finn by Mark Twan
Killer Angles by Michael Shaara
Moby Dick by Herman Melville
One Day in the Life of Ivan Denisovich by Aleksandr Solzhenitsyn
Roots by Alex Haley