September 11, 2001, is a day that will forever be etched in the memory of New York City. On that fateful day, many lives were lost in a tragedy that still resonates deeply in American history. Take a guided tour of Lower Manhattan and the Financial District to learn more about this pivotal day. You can visit the former Ground Zero site, hear stories of the heroes and first responders who risked their lives to save others, learn about the new World Trade Center complex, and pay your respects at the 9/11 Memorial.