Back in 2014 I started a Patreon site to support the creation of a generic fantasy Book of Lairs, using the Adventurer, Conqueror, King System RPG (ACKS for short).
Since then I have published a second book, the Book of Lairs: Urban Encounters, a third book, The Vale of the Iron God, a fourth entitled Book of Lairs: Abandoned Places, my fifth one: Book of Lairs: People & Places, and my penultimate book, Desolation, the sixth book. The final, seventh, book will be out towards the end of 2019.
The completed books are all available to buy.
Below I have placed the maps from the on-going series of books here for personal, non-commercial use in your own games. I hope that they come in useful.