Nov. 1 (UPI) -- The Grand Egyptian Museum in Giza, Egypt, is one of the world's largest and opened on Saturday after decades of delays and a cost of more than $1 billion. The 5 million-square-foot museum features exhibits and artifacts ranging across 7,000 years, from prehistory to about 400 A.D., according to CBS News . It also is the world's only museum that is dedicated to one culture, which is ancient Egypt. "It's a great day for Egypt and for humanity," Nevine El-Aref told CBS News. "This