Not only is Moscow the capital of Mother Russia, it's also been the power nexus for the country since early times.
And with that comes one of the busiest commutes in the world - where 9 million people pass through its rail system every day.
Watch the above video and find out more about the hidden systems in place that run chaotic cities like Hong Kong, Moscow, Delhi and Mexico City.
QUICK GUIDE TO RUSSIA: Plan your trip to Mother Russia
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