The boys over at Fenchel & Janisch spent a few years(!) shooting and editing together a documentary about their city, Frankfurt. As one of my favourite YouTube filmmaking resources, I was not surprised to find that their channel also contains some behind the scenes videos.
They also have their own informative blog post about the production journey.
As a former Frankfurt resident (well, kind of, I have spent a LOT of time in Frankfurt) I love to see their footage and I am always inspired by these guys!
Rent the video on vimeo.