United Airlines Flight 93 crashed in an empty field in Stonycreek Township, Pennsylvania, near the town of Shanksville, on the morning of September 11, 2001. The crash site is approximately 80 miles southeast of Pittsburgh and 150 miles northwest of Washington, D.C. Unlike the other three hijacked planes that day, which hit the World Trade Center and the Pentagon, Flight 93 did not reach its intended target—widely believed to be the U.S. Capitol building or the White House. This was due to the heroic actions of the 40 passengers and crew members who, after learning of the other attacks via airphones, fought back against the four hijackers. The struggle resulted in the plane diving into the ground at over 500 miles per hour, killing everyone on board but preventing a catastrophic strike on a high-value national symbol. Today, the site is home to the Flight 93 National Memorial, which includes a visitor center, a Memorial Plaza along the crash site's perimeter, and the "Tower of Voices," a 93-foot-tall structure containing 40 wind chimes.