According to Google Maps, the distance is less than 3 miles as the crow flies.
There probably is somewhere. You should be more specific and ask where. There is definitely a Washington Park in Portland, OR, here:...
Mount Ranier National Park. North Cascades National Park. Olympic National Park. Ebey's Landing National Historical Reserve Fort Vancouver National Historic Site Klondike Gold Rush National...
It used to be, but the Virginia "side" of DC was ceded back to Viriginia. Now, all that's left is the former "Maryland side".
4 including your mum (she is a big one)