What's open during the shutdown? A running list for travelers.

The interior of the Washington Monument is closed during the shutdown. MUST CREDIT: Craig Hudson/For The Washington Post Credit: For the Washington Post
The shutdown of the federal government this week has sent some travelers into a state of disappointment and confusion as they weigh plans to visit properties managed by the National Park Service. While outdoor national parks remain largely open, there are no workers to staff some historic sites and visitor centers, or direct some tours.
Some sites are closed off. Some are allowed to stay open. Or left in a partially functioning state.
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