In the aftermath of the Sept. 11 attacks, many beloved public spaces were abruptly closed or had their access severely restricted. At the time, the public generally resigned itself to the new restrictions as a necessary evil in a time of war.
Fifteen years later, the public has stopped noticing. In some cases, such as scenic overlooks at certain dams, the government spent millions on new roads and bridges to allow the public access from less risky positions. But in other places, the restrictions remain, and it's the public space itself that has faded from view.