Specifically for the Yellow King RPG (GUMSHOE) but usable for any cosmic horror RPG, but it would take a little bit of work..
The Handout to End All Handouts - The City Guide That Shatters Reality
At the end of the 19th century, an American art student went to Paris, read a play, and lost his grip on reality.
The play was called The King in Yellow.
Having read it, head reeling from absinthe, bedeviled by unseen adversaries, he realized that the alien world it described, Carcosa, had sunk its traces throughout the City of Lights.
As he explored Paris in search of its decadent influence, he created a scrapbook. A guide for himself, and for those who would come after him.
Yoked together from existing travelogues, newspapers, and the disquieting ephemera of the occult tradition, it laid out a skewed portrait of a haunted city:
In the margins appear the increasingly fervid scrawls of the anonymous compiler. Through them determined investigators of the Yellow Sign mystery will learn:
Absinthe in Carcosa is an indispensable city guide for The Yellow King Roleplaying Game and a stunning, full-color visual artifact in its own right.
Give it to your players and let them find the mysteries of Paris.
Or let them buy their own deuced copies and keep their snack-festooned fingers off of your pristine edition.
8.5″ x 11″, full colour hardback