This is shot from just outside of the cave entrance at Longhorn Cavern State Park in Burnet, Texas. The entrance is below ground level where it appears that an original portion of the cave collapsed and left openings through which the surface can be viewed (and photographed!).
Title: "Longhorn Cavern Entrance"

Camera / Lens: Canon 40D / Canon 17-55mm f/2.8 zoom
Post-processing: Photomatix Pro to combine three hand-held exposures (-2,0,+2) into one HDR (High Dynamic Range) image > Photoshop CS3 > Topaz Adjust plugin