出典:Wikipedia
出典:『Wikipedia』 (2011/07/23 19:12 UTC 版)
SubTropolis is a 55,000,000 square foot (5,060,000 m³), 1,100-acre (4.5 km2) manmade cave in the bluffs above the Missouri River in Kansas City, Missouri, United States that is claimed to be the world's largest underground storage facility.