11.   Both were built eathis century, and employ extraordinary stone steps and iron ladders to get hikers up the demanding rock faces.

12.   A rock face near the parking lot is dramatically two-toned, and exploration opportunities abound.

13.   Adams operated a photo studio in the national park and photographed its sheer rock faces and heroic sequoias in every season.

14.   But in recent years, researchers have unearthed documents that are helping them pry far more detail from the images on rock faces.

15.   Climbers sometimes must replace metal bolts and metal pitons in the rock face of the tower for their own safety.

16.   Entrance is gained by a small opening in a sheer rock face.

17.   Extreme athletes test their mettle by jumping out of planes, soaring off mountains, diving to the ocean floor, racing down hills, and climbing rock faces.

18.   He hunched slightly and, with Frankie holding his drill bit to the rock face, let rip.

19.   He will talk about growing up scrawny yet becoming a legendary scaler of rock faces and icefalls.

20.   I point to a squidlike shape in the rock face and ask them what it is.