"Although I likely could have gotten away with a few images, I really wanted to do the series properly and cover all 15 cities in the former USSR with metro lines, not just a few flashy ones in Moscow," Herwig said of his decision to photograph bus stops first.

Vydubychi is a station of Kiev Metro's Syretsko-Pecherska Line. This station was opened on December 30, 1991. Herwig/FUEL