America's History in the Making This course for middle and high school teachers uses video, online text, classroom activities, and Web-based activities to explore American history from the Pre-Columbian era through Reconstruction.
Which Famous Cathedral Collapsed?
Four of the grandest medieval cathedrals are shown -
one of which was not structurally sound and collapsed.
After looking at the photos try to select which cathedral
fell and see if you can determine, from the picture, why
it might have happened.
