Americans mark 22nd anniversary of 9/11

Americans are looking back on the horror and legacy of 9/11, gathering Monday at memorials, firehouses, city halls, and elsewhere to observe the 22nd anniversary of the deadliest terror attack on U.S. soil.

911 Memorial and World Trade Center Tour

In this video, Katie, a tour guide with Free Tours by Foot NYC, takes you on a tour of the National September 11th Memorial, also known as the 9/11 Memorial.