cities have been built with rock. Egypts pyramids and Sphinx are made
of limestone. Indias Taj Mahal is built from marble. New Yorks Empire
State Building is faced with granite and limestone. What makes a good
building stone? It should be attractive and easy to work withbut
not crack, crumble, or weather too easily.
On May 11, 1909, after five years of
construction, workers set the last stone on what would become the
Museum of Natural History. Like most of the exterior stone, it was
a piece of granite.