When it comes to big construction projects, they don’t come much bigger than the Great Pyramid of Giza! Made of 2.3 million stone blocks, it took 23 years to complete. As a side note: did you know that Cleopatra lived closer in time to today, Apollo 11 and the first man on the moon than she did to the Great Pyramid of Giza (built in 2560 BC). Yes, the Egyptians really were around that long!