This hi-res version of the Vault of the Dracolich poster map was originall included in the D&D Game Day adventure Vault of the Dracolich.
This piece was also included as a game inspiring sample map in the the 5th edition release of the D&D Dungeon Master's Guide
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 12200 x 8600 pixels, it's perfect for home printing or screen display. Purchase it now to help run the adventure and raid the dracolich Dretchroyaster's lair.
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