My wife and I used Blenheim as our wedding venue and we were pleased with the experience.  The venue is a beautiful and picturesque Civil War site with a modern building adjacent to it. The grounds are available if you want to put up a dining tent as we did.  We set up lawn games for the kids (and adults) on the large grounds which made the reception even better.  Fairfax County made the rental process easy.  It was affordable as venues in the National Capital Region go.  The staff on the day of the wedding was very helpful to our wedding planner and flexible when things didn’t work as planned as always happens on a wedding day.   Because Blenheim is a historic site and sits amid a residential area there were certain restrictions, however, the restrictions did not make us significantly alter our wedding plans.  You must plan your wedding around the public times for the historic site so that causes some limitations, but again, we were able to make everything happen even with the restricted time schedule.  We had an amazing wedding at Blenheim and would suggest our friends and family use it for their weddings or events.