I would like to highly recommend reading the following classical books:
Henryk Sienkiewicz – With Fire and Sword, the Deluge, Colonel Wolodyjowski, Quo Vadis
Fyodor Dostoyevsky – Notes from Underground, the Brothers Karamazov, the Devils and the Idiot
Ernest Hemingway – A Farewell to Arms, For Whom the Bell Tolls, the Old Man and the Sea
Harper Lee – To Kill a Mockingbird
Friedrich Nietzsche – Beyond Good and Evil, On the Genealogy of Morals, the Antichrist, the Gay Science, the Will to Power
George Orwell – 1984, Animal Farm
Aleksandr Solzhenitsyn – Cancer Ward, the First Circle, the Gulag Archipelago: Vol. 1; Vol. 2; Vol. 3.
John Steinbeck – The Grapes of Wrath, Of Men and Mice
Ayn Rand –Atlas Shrugged, Night of January 16th, Capitalism: the Unknown Ideal, the New Left: the Anti-Industrial Revolution, For the New Intellectual, the Virtue of Selfishness, We the Living
Michael Crichton – State of Fear, Pirate Latitudes, Dragon Teeth, the Andromeda Strain, Disclosure
Mark Twain – the Adventures of Huckleberry Finn, the Adventures of Tom Sawyer, On the Decay of the Art of Lying
And of course, countless more books written by the most intellectual people throughout the centuries are available for readers worldwide. This is my partial classical list for a mandatory reading in schools.