Will Smith Walks Through Deserted Zurich, Compares It to 'I Am Legend'

Play video content Will Smith might want to start gearing up for the apocalypse ... 'cause he seemed to have the streets all to himself in the early morning -- and, it got him thinking about "I Am Legend." The actor shared a video to Instagram ... telling fans he's walking through Zurich, Switzerland, in the early hours and flashing back to the hit 2007 flick -- 'cause he says he's not seeing another soul. Smith…