1.   Above, the cleft was barred by vertical walls forming a difficult obstacle, demanding care and attention.

2.   Soon they were between vertical walls and the river was roaring mud.

3.   ...a climber inching up a vertical wall of rock.

4.   A look up on the walls produces a chilling view of young people climbing the vertical walls, laughing and shouting.

5.   After rescuing Deel and Lee, firefighters realized Reno was trapped on the other side of the floor, which nearly became a vertical wall.

6.   Few houses have truly vertical walls or trim.

7.   Hanging waterfalls tumble hundreds of feet straight down the vertical walls of rock on either side of Bubbs Creek.

8.   High vine screens for Virginia creeper create a vertical wall from the street above, where a second phase of the park will eventually be planted with plane trees.

9.   In many places, sheer vertical walls prevented passage to the next pool and I was forced to climb back to the top in order to follow the river.

10.   The ceiling of the room is a series of half-round vaults, connected by raised ribs that rest on pillars partially emerged from the vertical walls.