The King of Prussia Volunteer Fire Company 9/11 Memorial is the largest memorial commemorating the September 11 attacks in Montgomery County and consists of four features : the 9/11 Monument , the World Trade Center Patio , the William C. Daywalt Sr . Memorial Gazebo , and the Entrance Pathway and Stairs . The World Trade Center Patio shows the layout of the site of the World Trade Center in New York City , displaying the seven buildings , the central plaza , and the four streets that surround the site . The patio is accurately oriented north-south as it actually was and is in 1/52nd scale . The 9/11 Monument is designed to commemorate the four events that happened during the attacks . The concrete base and walkway around the monument is circular shaped to symbolize the circular hole that was left in the ground from the crash of United Airlines Flight 93 in Shanksville , Pennsylvania . Within the circular base is a pyramidal pentagon made of granite that symbolizes The Pentagon in Arlington , Virginia and the crash of American Airlines Flight 77 into the building ; the granite pentagon is in 1/104th scale . From the top of the pentagon rises two stainless steel tops representing the two towers of the World Trade Center , which are in 1/52nd scale . On top of the stainless steel tops sits two steel beams from the World Trade Center that were recovered from Ground Zero , oriented to represent the elevator cores in the two buildings . The steel beams are about and weigh about ; the studs in the steel are in diameter and long with heads that are in diameter . The circular base has a radius of and a circumference of . The length of the circumference of the circle symbolizes the 1 square acre footprint of each tower of the World Trade Center , with a square acre being on each side . The circular base has an area of , which dedicates for each of the 343 firefighters killed in the World Trade Center attack . The tops of the World Trade Center towers have 40 lights that represents the passengers and crew killed in the crash of United Airlines Flight 93 , with 20 lights in each tower oriented in a circle
American Airlines Flight 77
American Airlines Flight 77
King of Prussia Volunteer Fire Company 9/11 Memorial