Thanks to Ruther2 on Twitter for sourcing the following filming photos from Central Park, NY where the "Doctor Who" crew are working on episode 5. Alex Kingston is expected to join the cast tomorrow:
Courtesy of ahab99:
Courtesy of hubmedia:
Courtesy of annoregni
Courtesy of parallaxianjess
Obviously, more pics will emerge as the day goes on so it's definitely worth your while to follow Ruther2 on twitter - he's always on the ball as regards filming locations, photos etc.
EDIT: More photos can be found at Getty Images and spoilertv.co.uk