At the turn of the last century, the dinosaur Diplodocus carnegii was world-famous, and at the time the largest animal known to have walked the earth. It was so large in fact that Andrew Carnegie in 1907 had to expand his Oakland museum -- and his dinosaur hall -- to house the 84-foot-long skeleton.

		Mac users Viewers using Macintosh computers are encouraged to download this video in Quicktime format. It is available in one broadband size, large.

One hundred years later, Carnegie Natural History Museum is expanding its dinosaur hall again, this time tripling its size, to accommodate 19 dinosaur skeletons.

The $36 million hall was built in a former outdoor atrium behind the museum complex, where garbage had been stored. Windows on one side look down from the stacks at the main Carnegie Library branch.

The former hall -- which became crowded with dinosaurs in out-of-date poses, grouped in historically-inaccurate bunches -- will become the home this spring of two Tyrannosaurus Rex skeletons.

Work started in March 2005. The public reopening is Wednesday.

Questions or comments on this presentation may be sent here. This video was produced by Melissa Tkach.