Rory,
Yes, I noticed Grahame White on the hangar as well and wondered if it might be the UK, but the clothes are clearly American and I discovered that Claude Grahame-White was in the US at the right period, demonstrating his Farman, including landing in front of the White House. You wouldn't want to try that today.
I suspect it might be College Park Airport:
...the world's oldest continuously operated airport.
College Park Airport - Wikipedia, the free encyclopedia