Tunnel and escalators at a Metro train station in Washington, DC. I liked the sci-fi sort of H.R. Giger vibe to it and the texture of concrete walls. Not all was perfect that day: the left escalator wasn't working, hence it didn't blur. There were quite a few people on the other escalators who blurred to nothingness in this 30-sec exposure. Canon 5DMkII, 16mm, 30 sec, f13
