On this grim, gray Sunday, Washingtonians have a couple of options. They can stay in and root for their NFC East brethren, the Dallas Cowboys, as they face off against the dread Minnesota Vikings. Barring that — and I understand some Redskins are unable to acknowledge NFC East solidarity — the National Mall offers a number of warm, dry, and brightly lit rooms for appreciating other national treasures. K’s Clicks features an inviting image from the National Archives.