Russian photographer Andrey Kruglikov posts these spectacular images of the Moscow and St. Petersburg Metro stations to his Instagram account. Kruglikov's choice of black and white for the images perfectly accentuates the striking line and curve of such architectural treasures. These underground stations were largely built pre-Cold War-era, sparing no expense for materials like marble and crystal chandeliers.
See more of these shots in this i09 article, and follow Kruglikov's Instagram account subwayspecial to keep up with his posts.