rubble

noun  /ˈrʌb.əl/

Definition

1. the piles of broken stone and bricks, etc. that are left when a building falls down or is destroyed.
2.  waste or rough fragments of stone, brick, concrete, etc., especially as the debris from the demolition of buildings.

 Example

• The bomb reduced the house to rubble.
•  The tower is built of stone rubble faced with ashlar.