How many what silly question
Many built fallout shelters.
Built bomb shelters
yes the later pyramids were built with brick with a stone casing
the men
Shelters were built in World War 2 as protection against bombs and chemical scares
"The house is built of bricks." is correct; the noun brick is a countable noun. The second one could be rewritten: "The house is a brick house." (brick as an attributive noun describing the noun house) or "The house is brick." (brick as the substance of which the house is made).
Castles were built out of stone or brick
It has to built with brick or stone
In the 60's we called them "bomb shelters."
with lime stone
Caves, huts and easily built shelters.
snow shelters were built using large blocks cut out of hardend snow