15 Japanese Megaprojects That Will Completely Change the Country Forever

Japan is quietly building 15 massive projects that could reshape its future, from maglev tunnels and floating wind farms to AI data centers and advanced chip factories. Across Tokyo, Osaka, and Hokkaido, these projects are designed to solve problems involving transportation, energy, technology, climate risks, and shrinking cities. At the center of the transformation are Rapidus, Woven City, the Chuo Shinkansen, offshore wind, and a new generation of underground infrastructure. But behind all fifteen projects is one enormous challenge: Japan is running out of workers as its population rapidly ages and shrinks. These megaprojects may reveal Japan's boldest strategy yet—using infrastructure, automation, and technology to build a future with fewer people.