Mysteries RV Project:
Target #10a: The target is the cause of the collapse of Building 7 of the World Trade Center complex in New York City on 11 September 2001. The viewer should perceive the actual collapse of the building as well as the direct cause of the collapse for Building 7, including any activity prior to the collapse that may be related to the collapse.
Note: Building 7 is the red-tinted building behind the Twin Towers in the above photo. The North Tower is in the middle with the antennae on top, while the South Tower is to the right.
Photo credit: Jeffmock (from Creative Commons of Wikipedia)