The Shimizu Mega-City Pyramid is a futuristic project proposed for construction over the Tokyo Bay in Japan. The proposed structure is a pyramid that would be about 14 times higher than the Great Pyramid at Giza, and would house 750,000 people. The structure would be 730 meters above mean sea level and will include five stacked trusses, each with similar dimensions to that of the great pyramid of Giza. One major foreseeable constraint is that due to the size of the proposed structure, it will not be possible to construct it with currently available material. The design depends on the future availability of super-strong lightweight materials based on carbon nanotubes.