Ancient and modern wonders of architecture and engineering connect across nearly five millennia of human civilization as the main pyramid of Giza commands the view from inside the new Grand Egyptian Museum, in Cairo, Egypt, Nov. 5, 2025. Archaeologists estimate it took up to 30 years to erect the pyramids. The new museum, housing vast collections of some of the world's most significant objects of antiquity, took nearly as long to build. Its cornerstone was laid in 2002 and its final finished halls opened to the public this past week.