The Mega Pyramid would be 6,561 ft high and house 250,000 residents.
The Shimizu Mega Pyramid, or "TRY 2004" is a proposed megastructure to be built in Tokyo Bay, Tokyo, Japan. Described as a "city in the air," the building would have a 86,100-sq-ft foundation on 36 concrete piers supporting an open pyramidal frame made of yet-to-be-invented materials composed of super-strong carbon nanotubes. The 6,561-ft structure would be divided into eight levels, with space for 250,000 permanent residents and a fully occupied capacity of nearly 1 million people.