Online Video Guide

Tokyo is one of the most crowded cities in the world with nowhere left to build. To relieve the stress on a city bursting at the seams, engineers have trained their imaginations to the only vacant lot around the waters of Tokyo Bay. The dream: to build a massive Pyramid over the water, with skyscrapers suspended like peapods within it's enormous frame. Called the Shimizu Mega-City Pyramid it would be a kilometer tall and could be home to 750,000 people -- and possibly without the help of human builders. With the invention of new super-lightweight materials, humanoid robots, and self-assembling structures the pyramid might be the first city in the world able to build itself. But troubling questions plague it. Can it find the energy it needs not to be a burden on Tokyo? And would it be safe from one of nature's most terrifying forces -- the massive tidal waves called tsunamis? Engineers and scientists in the U.S., Japan, Canada, Scotland and Wales are hard at work tackling these and othe