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There are a number of stories where he visited America. If you're referring to the television alone, then I could list them out now, but if you're considering the Doctor Who Universe in its entreaty - let's just say it will take a lot of time.

"The Chase" (1965) - New York, the Empire State Building "The Gunfighters" (1966) - Tombstone, Arizona Doctor Who: The Movie (1996) - San Francisco, California Dalek (2005) - Salt Lake City, Utah "Daleks in Manhattan"/"Evolution of the Daleks" (2007) - Manhattan, New York "The Stolen Earth" (2008) - New York "The Impossible Astronaut"/"Day of the Moon" (2011) - Utah/ Washington D.C./ Florida/ Area 51/ New York "A Town Called Mercy" (2012) - American Frontier "The Angels Take Manhattan" (2012) - Manhattan, New York