jan 1, 2490 BC - Building the Great Pyramids
Description:
The pyramids were built out of large irregular blocks of limestone. There are an estimated 2.3 million blocks weighing 6 million tons. They were also the tallest manmade structure in the world for over 3800 years.Added to timeline:
Date:
jan 1, 2490 BC
Now
~ 4517 years ago
