The museum is built within the archaeological remains of the World Trade Center, with a surviving retaining wall which is still covered with missing posters and memorial inscriptions place there by New Yorkers. It will also give you a sense of the scale of the buildings which were destroyed. The historical exhibition presents the story of 9/11 in three parts, divided into the events of the day, the events leading to the attacks, and the world after 9/11/ There is also a memorial exhibition commemorating the lives of all those who died in the attacks, and an exhibition for the stories of those who witnessed the attacks. The memorial, which doesn’t require a ticket, is formed of twin reflecting pools, each nearly an acre in size, and containing the largest manmade waterfalls in North America. The names of each victim of the 9/11 attacks on the World Trade Center, the Pentagon, and the passengers and crew of Flight 93, and the 6 people killed in the World Trade Center bombing of 1993, are engraved on the outside of the memorial. Visitors can also see the Survivor Tree, which was found among the rubble of the World Trade Center, made a recovery, and was returned to the site as a reminder of resilience and rebirth.