Battery Kemble, formerly a Union Army defense against the Confederacy, has a hill that’s perfect for sledding or, on warmer days, is a peaceful place to walk with a canine companion.  For longer walking trails, Washingtonians choose Glover Archbold Park. The 183-acre park spans from Van Ness Street NW at the north end to Canal Road NW in the south and has a roughly 2½-mile trail that runs almost the length of the park.