He was looking at a door on a concrete wall.

There was no door any more, just a concrete wall.

He wrote the four letters large on the concrete wall.

The corridor came to a dead end at the concrete wall.

The sky above the concrete wall around the pool is clear blue.

They stood now near the concrete wall of one pen.

The concrete wall next to her seems to leap as well.

A heavy blue door set into a solid concrete wall.

The concrete wall was rough and cool against his back.

In 1928, a concrete wall was erected around the ground.