The difference between the bright burning metal and the black factory walls was too extreme for her camera.

VOA: special.2009.05.10

Rock walls made of wood or concrete have places for the climber's hands and feet.

VOA: special.2009.12.09

Its walls were made of glass. It contained everything needed for people to live.

VOA: special.2010.05.30

Thick walls are extremely heavy, and allow less room for windows and light.

VOA: special.2010.03.31

But too often their cry for help has sounded hopelessly against the outer walls, while others -- less deserving -- find easy entrance to the halls of Congress.

VOA: special.2010.06.24