I have been an on-again, off-again role-playing game player since I first discovered the hobby in high school. Since moving back to Boston at the start of this decade, I've had the pleasure of playing with some remarkably creative game masters. The first of these was Joshua Wright, an archaeologist and world traveler who expertly applied his first-hand knowledge and experience of cultures past and present to help guide and shape the stories that our group would tell together.
Josh recently departed for greener scholarly pastures on the left coast. After settling in there, he put back up online some web pages, PDFs, and other digital goodies that he'd made as supplementary material for the many games he's run over the last couple of decades. The campaign I played in is under the red "Nephilim" link; it was an instance of Nephilim, an RPG of supernatural secret histories.
I link to them here with Josh's permission, and present them without further context, both because they are more delightfully mysterious that way, and because I am lazy. I invite players and GMs of all role-playing game types to poke around; among the character sketches, plot outlines and historical-fact (and "historical"-"fact") compilations, you may find some unexpected inspiration.