Image via WikipediaDistrict of Columbia is 68 square miles, but most government attractions and many of the Smithsonian museums are within an easy walk of the National Mall. The Metro is easy to navigate and buses get you to neighborhoods like Georgetown. The city has four quadrants -- Northwest, Southwest, Northeast and Southeast -- and you'll notice addresses designated accordingly (NW, SW and so forth). The U.S. Capitol marks the center where they meet. Numbered streets run north/south, lettered streets run east/west and avenues (which are named for U.S. states) run diagonally.
