10 Fun Facts About Popular World Capitals You Probably Don't Know

2. Tokyo’s Underground Secrets

Tokyo, Japan's bustling capital, is a city of contrasts, where ancient traditions meet cutting-edge technology. Beneath its neon-lit streets and towering skyscrapers lies a hidden world that few know—the G-Cans Project, also known as the Metropolitan Area Outer Underground Discharge Channel. This massive underground facility, located on the outskirts of Tokyo, is the world's largest stormwater management system, designed to protect the city from flooding during typhoons and heavy rains. The G-Cans Project consists of a network of tunnels, massive silos, and an enormous underground water tank known as the "Temple of the Underground." This engineering marvel can hold up to 670,000 cubic meters of water, effectively preventing floodwaters from inundating the city above. The scale and sophistication of this project are a testament to Tokyo's commitment to safeguarding its residents and infrastructure from natural disasters. Visitors can even tour parts of this subterranean wonder, gaining insight into the city's innovative urban planning and disaster management approach.