My favorite of their collaborations was their update/rewrite of Dante's Inferno, called, natch, Inferno.
I read this many years ago. I thought it was excellent. I agree with you - many memorable scenes throughout the book. By the way, I finished Forever Odd by Dean Koontz and Black Rednecks and White Liberals be Thomas Sowell. I started John Adams by McCollough and also Unhinged by Michelle Malkin.