During construction there were several problems with the building stone.
"We're taking it as a building stone," she said, "part of my training."
"I should have known that the building stones came from a volcanic source."
A lot of them were pulled down to use as building stone.
The inside of the Colosseum was used to supply building stones.
He stopped people from taking any more building stones away.
Following these to the water side, he soon found what had become of the missing building stones.
The sandstone has also been heavily used as building stone.
Not much, Frank thought, not when the main local building stone was ice.
It is the largest building stone found in Israel and second in the world.