Moscow’s underground transit system is now more than 80 years old, and carries up to 9 million passengers through more than 200 stations every day. Most of the architecture and decor was built decades ago, meant to be a showcase for Soviet artists, ideals, and icons. The system is now modernizing, in part, preparing for the 2018 World Cup, which will be hosted in Russia. Several Reuters photographers have captured images of the varied and unique Moscow Metro stations, as well as the workers and passengers underground, over the past year.