Paying Respects

Part of the Flight 93 Memorial in Pennsylvania.

This "path" is part of the route of the final millisecond of Flight 93 just before it pile-drived upside-down into a field.  (Behind this shot.)  

According to the National Park Service,
"Flight 93 struck the ground at a 40 degree angle almost upside down, hitting right wing and nose first, at a speed of between 563-580 miles per hour."