Are the monuments and museums in Washington DC within walking distance of each other?

I will be traveling to Washington DC this week and since my trip is limited by few days I want to plan ahead so I can see as much as I can. I will be there for 3 days. If I take the metro to White house can I walk to smithsonian, memorials, arlington cemetery? What is withing walking distance of what? So I can plan a trip per day, taking one trip and walking the rest of the day. Thanks