Timeline of Egyptian Pyramid History By 24skitzler 1800 BCE Last Pyramids were built in Egypt. Period: 1800 BCE to 1992 Timeline of Egyptian Pyramids History 1300 BCE Khaemwaset restored Unas the pyramid. 500 BCE Herodotsus visited some of the pyramids. 100 BCE Diodorus Siculus visited some of the pyramids. 820 Calph al-Mamun broke into the Great Pyramid. 1798 Battle of the Pyramids 1954 Two boat pits were found next to some of the pyramids. 1992 A robot explored the air shafts in the Great Pyramid