Bonus. Some remnants remain in and around the building

9/11 slurry wall

In addition to some paintings that were salvaged, many other features of the original World Trade Center are still located on-site. The original slurry wall of the World Trade Center enclosed an enormous basement the size of four-by-two city blocks, known as the “bathtub,” that held back water from the Hudson River. Half of the World Trade Center site sits on a landfill over what was originally marshland and water. The basement took up 70% of the World Trade Center site and was surrounded by a 3,500 foot long, three-foot-thick slurry wall.

The wall survived the 9/11 attacks largely intact, and part of the slurry wall became the focal point of Foundation Hall at the 9/11 Memorial. The hall contains the “Last Column,” a 36-foot tall piece of steel signed by first responders, recovery workers and volunteers. The creation of the “bathtub” of the original World Trade Center resulted in the excavation of one million cubic yards of soil and other material, which eventually formed the foundation of Battery Park City. Other notable remnants include the Twin Tower tridents, Liberty Street Pedestrian Bridge, the Koenig Sphere and the Survivor Tree.

Next, check out 10 Remnants of the Original World Trade Center Still on Site.