Each year since 2015, the Tunnel to Towers Foundation has held the Tunnel to Towers Tower Climb NYC at One World Observatory at One World Trade Center in New York City. One thousand participants climb 104 stories, symbolizing strength, hope and the resiliency of the American spirit. The event celebrates the life and sacrifice of all 9/11 heroes, including FDNY firefighter Stephen Siller and FDNY Captain Billy Burke. On September 11, 2001, Stephen Siller, a FDNY firefighter assigned to Brooklyn