The fortress of Kungälv was a border fortress at the former border between Sweden and Norway. Built in the mid 17th century as a grand stone fortress. During the years, people have plundered the castle for stone and other building material. Just one of several towers still standing.
This film is a test flight with the Phantom 2 Vision. A bit windy and shaky and the field of view is set to just 90 degrees to try it out and to get a bit closer.