This book retraces a journey begun in February 2002, six months after the events of 9/11, and ending in February 2003, some weeks before the announcement of an official master plan for Ground Zero. It consists of two parts and an appendix. Part one documents a series of questions raised during a seminar, 'Questioning Ground Zero', that Bernard Tschumi conducted with a group of Columbia students as well as in short texts written by Tschumi. Part two presents a counter-project, also in the form of a question, about the city of the 21st century, as suggested by the exemplary Ground Zero site in downtown Manhattan. The appendix provides footnotes in the form of diagrammatic plans and sketches, as well as a personal text"--Page [6].