i saw a movie back in 2002-03 about a family that breacks down in a deserted town in the desert, and they find a canyon/reveen full of cars that are stacked in the shape of a symbol. the mother also falls through the floor of a house and in to a network of tunnels, and finds boxes of peoples possesions, and then somthing starts to chase her.

does anybody recall seeing this film and if so can they remmeber the name?:)