Rebecca Noble / Getty Images / Getty Images The National Park Service logo is displayed at Glen Canyon National Recreation Area in Page, Ariz., on July 10. National parks are a big question markDuring the 2018-2019 shutdown, the Trump administration kept national parks accessible to the public, even as many National Park Service employees had to stay home. But a shutdown could delay routine maintenance, upgrades and long-term projects for less critical services, according to the National Weather Service. — Liz Ruskin, Alaska Public MediaColoradoRocky Mountain National Park was the fifth-most visited national park last year. "Leaving national parks open without National Park staff to help protect visitors and resources is not only irresponsible—it's dangerous," Thompson wrote in a statement to KQED.