The Balloon Project is a video project that started with the idea to send a video camera over the city of San Francisco - no strings attached: just the wind, gravity, and chasing it down to wherever it lands.
Since then they’ve carried out similar projects in Marfa, New York and Berlin, which features in the video below.
VIDEO LINK
The official website is here, and all of their videos, including the retrieval of the Berlin camera are here.