Even better that finding one, you can make one.
Look at using a Quake III BSP, as that is probably the easiest way of learning how to create / load maps. Look at the 'LoadBSP' command, then learn how to use simple map editors like GtkRadiant (google it) and create textured, lightmapped levels.
Look at using a Quake III BSP, as that is probably the easiest way of learning how to create / load maps. Look at the 'LoadBSP' command, then learn how to use simple map editors like GtkRadiant (google it) and create textured, lightmapped levels.