To one side of the reflecting pools of the 9/11 Memorial is the glass atrium of the Memorial Museum. The museum descends some 70 feet down to the bedrock the Twin Towers were built on, and displays a collection of donated artifacts, memorabilia, photographs, and various recordings, as well as an exhibition that takes visitors through the history of events leading up to the attack and its aftermath. There's also a memorial wall with portraits of those who died, pieces of the Towers' structural columns and foundation, and remnants of the "Survivors Stairs," which allowed hundreds of people to escape the buildings. Current access the museum and the Memorial is from the intersection of Liberty and Greenwich streets, the intersection of Liberty and West, or the intersection of West and Fulton. Admission to the museum includes the 9/11 Memorial.