The BBC has published at the programm “Forces of Nature” an interactive video with spectacular images of the Human Towers.
The shooting took place in Tarragona “Castells” (Human Castles) competition. In the video, one can obtain technical information on how to make castles at different times. The managers of the program, making a tour of all parts of the world to find spectacular images and provide them a scientific perspective, take the protagonist “enxaneta” Carla, a 7-years-old girl.
You can watch the video here, at the Vilaweb article about it.
If you press the interrogation signs in the video you will get information about the Human Towers. There appear 3 during this video.