In this location, artists such as Carola Dertnig and Michael Richards participated in the World Views artist's residency. Two tilted pyramids made up a Masayuki Nagare sculpture in this location titled Cloud Fortress. Saul (10[1])Wenegrat commissioned Josep Royo and Joan Miró to create a tapestry for this location. (-5[1])A (-5[1])sculpture of a bronze sphere by Fritz Koenig was relocated after suffering (10[1])damage during an event in this location that also caused the disappearance of Alexander Calder's Bent Propeller. It's not (10[2])in St. Louis, but Minoru Yamasaki designed the original buildings in this location, whose current buildings include one designed by David Childs and Daniel Libeskind that is 1,776 feet (10[1])tall. For (10[1])10 points, name this skyscraper complex where many works of art were destroyed due to a terrorist attack (10[1])on September 11, 2001. ■END■ (10[2])