The Environmental Protection Agency, of course, was closed.
The National Parks were open, but mostly unstaffed, which was unfortunate as trash and waste piled up, and a lack of supervision encouraged the worst of us to destroy what had been left unprotected.
Our historical parks, such as Gettysburg National Military Park, were closed.
The U.S. Forest Service was shut down, as was the Bureau of Land Management (BLM), although BLM employees in charge of issuing oil and gas permits on public lands were working.
And in a bit of striking, in-your-face irony, the offices in the Department of Homeland Security that are responsible for administering the e-verify system, where employers are required to check the legal status of their workers, was shut down and could not be used.