This hi-res map of The Spiral is one of a set that was originally created for the adventure Captain Slygo's Treasure; written by Timothy Ide for issue #208 of Dungeon Magazine.
In one simple download you get both the DM and players versions of the map as well as an un-gridded rendering that's perfect for use with any virtual tabletop software. Sized at 2636 x 3000 pixels, it's perfect for home printing or screen display. Purchase it now to help run the adventure or use it on it's own and spice up your game night.
P.S. For a quick and easy tutorial on resizing digital battle maps for printing and use with miniatures, make sure to visit Schley's Tutorials.