If you're looking for more classics to put on the list. There's a few I've come across in my challenges - either I've read them or I've put them on my list to read them.
I loved
Crime and Punishment by Fyodor Dostoyevsky,
The Outsider by Albert Camus,
1984 by George Orwell,
Call of the Wild by Jack London
Fahrenheit 451 by Ray Bradbury
To Kill A Mockingbird by Harper Lee
Lord of the Flies by William Golding
Some of these are modern classics I guess as they aren't quite as old. But I'm happy to include them on the list.
This year I'm hoping to read:
The Brothers Karamazov by Fyodor Dostoyevsky
A Tale of Two Cities by Dickens
The Good Earth by Pearl S Buck
Twenty Thousand Leagues Under the Sea by Jules Verne
The Great Gatsby by Scott Fitzgerald
War of the Worlds by H G Wells
and maybe a Kurt Vonnegut - not sure which one yet.
Other than that there are others I want to read. The list really does go on...