Egypt opened a series of galleries to the public on Tuesday in its flagship new museum, but the glittering King Tutankhamun collection and solar boats buried by the Pyramid of Khufu are yet to be unveiled, pending a long-delayed grand inauguration. More than 20 years under construction, the sprawling Grand Egyptian Museum (GEM) next to the pyramids of Giza was initially scheduled to open in 2012 but the launch was repeatedly pushed back due to cost overruns and political tumult.