Most of James Clavell, especially like Noble House, Tai-Pan, Shogun

Several by Michener: Centennial, Chesapeake

Armegeddon by Leon Uris

Word of Honor by Nelson DeMille

Anything by Michael Connolly

For Westerns: It starts and ends with Louis L'Amour (although I just released a western, so stay tuned)

and about 50 others