September 11th National Memorial Trail

September 11th National Memorial Trail, also known as the 9/11 Trail, is a network of trails and roadways nearly long connecting the Flight 93 National Memorial, the Pentagon Memorial, and the National September 11 Memorial & Museum. It is tribute to those who perished in September 11, 2001 attacks and to those who responded to them.
The dedication was initiated by an act of Congress. President Joe Biden signed H.R. 2278, officially designating the trail route on October 13, 2021.
The triangular-shaped trail - to the sites of the memorials in Arlington, Virginia and New York City, and near Shanksville, Pennsylvania - passes through six Mid-Atlantic states and Washington, D.C. At its inception it incorporated 55% off-road trails and 45% existing roadways. A 1.5 mile purpose built section was added thereafter.

Existing trails along the route

Clockwise from the Pentagon the triangular 9/11 Trail incorporates many sections of existing trais, as well as overlapping segments of the East Coast Greenway.