Double Check is a 1982 sculpture by John Seward Johnson II, located across from Zuccotti Park at the corner of Liberty Street and Broadway in Manhattan, New York City. The bronze sculpture portrays a well-dressed businessman sitting with his briefcase open, which are filled with office materials getting ready to enter an office building. The statue is notable for its association with the 9/11 attacks.

The Jersey City 9/11 Memorial is located on the Hudson River Waterfront Walkway at the foot of Grand Street in Paulus Hook near Exchange Place in Jersey City, New Jersey. It comprises three components: a sculpture of steel girders from the original World Trade Center, an inscribed black granite stele, and Makeshift Memorial. The site on the Hudson Waterfront opposite the World Trade Center site was a triage set up during the '9/11 boatlift' and thereafter became a staging area for rescue operations.