In 1995, the airport opened Founders' Plaza, an observation park dedicated to the founders of DFW Airport. The site offered a panoramic view of the south end of the airport and hosted several significant events, including an employee memorial the day after the September 11, 2001 terrorist attacks and the airport's 30th anniversary celebration in 2004. As part of the perimeter taxiway project, Founders' Plaza was closed in 2007 and moved to a new location surrounding a -tall beacon on the north side of the airport in 2008. The plaza features a granite monument and sculpture, post-mounted binoculars, piped-in voices of air traffic controllers and shade pavilions. In 2010, a memorial honoring Delta Air Lines Flight 191 was dedicated at the plaza.