One of the city's most stunning attractions is the Washington National Cathedral that began construction in 1907 and was not completed until 1990. Theodore Roosevelt was just one of the Presidents who oversaw the cathedral's construction, and every US President has attended services there. The structure is approximately one-tenth of a mile long and it contains more than 200 stained-glass windows that create a mesmerizing effect when the sun shines through. The observation gallery within the cathedral offers still more unbelievable vantage points, and there are regular tours that explain the architecture, history and the church's mission in further detail.
Considering how much history there is in Washington and its surrounding areas, taking a walking tour will get you even closer to these venues and help you gain an even deeper insight to the lives of the people that shaped history. The Fairfax Museum and Visitor Center schedules various informative and detailed guided walking tours of historic Fairfax. Some of the highlights along the way include a handful of the city's oldest structures like the Gunnell House that dates back to 1830, the Old Fairfax Jail that originated back in 1891 and the Moore House that was originally constructed in 1840.
Deciding that you will take a day to see the Smithsonian Institution is allowing too little time, as the Institution is much wider in scope than you may have originally thought. It actually encapsulates 19 museums as well as the National Zoo, all home to must-see exhibits and attractions. Some of the more popular stops within the Smithsonian include the National Air and Space Museum, the national Museum of American History and the National Museum of the American Indian. The depth and breadth of everything here justifies the time and space that it takes to see it all.
The Washington and Old Dominion Trail (W&OD or "Wad") is an excellent recreation trail that runs through the Northern Virginia counties. The 45-mile trail is completely paved with nine foot wide asphalt and has a yellow painted center line. To run the whole trail and back means you're looking at a 90-mile trek, but it can be done over the course of two days thanks to the hotels and bed and breakfasts along the trail. The only real complaint from bikers is that there's much traffic most of the time due to the Wad's immense popularity.