The Most Incredible Underground Cities & Structures Scattered Across The Globe

Multiple Cities In Japan

While not quite a single city in Japan, it’s worth mentioning that the country has a collection of underground structures scattered across the region. Japan is commonly referred to as one of the countries with the highest population density, averaging at around 900 people per square mile. Officials put a contingency in place for the future, realising that the island would not be able to accommodate its inhabitants indefinitely over time. The decision was made to build skyscrapers and to construct underground complexes in order to mitigate future troubles with population size.

Multiple Cities In Japan