You might think it morbid, but people have many reasons for visiting the sites of battles and disasters.
Even indirect exposure to the terrorist attacks of September 11 has left profound and deep impact on those too young to remember a world before that.
Those involved with the monumental task faced many challenges as they balanced the unquestionable priority of remembrance with the commercial task of recreating an economically vibrant downtown.
The American Muslim population is one of the most diverse. So, what are the religious and political leanings of America's different Muslim communities?