Thousands remember 9/11 at Colorado Memorial Stair Climb

More than 2,300 people gathered the morning of Tuesday, Sept. 11 to "never forget." The participants of the 2018 Colorado 9/11 Memorial Stair Climb paid tribute to the 343 FDNY firefighters and almost 3,000 Americans who died on 9/11 by climbing the equivalent of the 110 stories of the World Trade Center.