There are lots of resources for ‘dungeon tiles’ and battlemaps out there, if you’re playing a game that uses 25-28mm miniatures and you like one-inch squares. Many of these come from miniatures games that use one-inch squares; Go searching for ‘Heroquest’ or ‘Star Wars Miniatures’ and you’ll find them! Keep in mind that if you search for ‘Mage Knight’ stuff, they’re a slightly larger scale.
Wizards of the Coast put up a mess of gridded maps for their D&D Miniatures game. This page also has foldup terrain (scroll to the bottom).
Ye Olde Inn has a mess of tiles meant for the Heroquest game line, as well as added scenarios for that game.
Greywolf has some tiles, doors, and supplemental Heroquest material.
Warhammer Quest Chronicles has some neat rooms.
The DND Miniatures Tile Archive has very nice tiles and maps to add to your game.
The Holocron has maps and tiles for Star Wars Miniatures that would be useful in a sci-fi game (and some of them in a fantasy game, as well). There are even more Star Wars tiles at SWMiniatures and Star Wars Miniature Maps.
Jabba's Palace
