The National Archives is the ultimate historical storage unit. Every significant document and tangible piece of history is cataloged and stored here. The site houses everything from the Declaration of Independence, to the Louisiana Purchase, to the Watergate tapes. When you walk in, you'll be struck by the fortuitous, 75-foot rotunda where the most treasured documents are on display. Maps, movies, photographs, texts and more are all here, and you can delve into your own research if you are looking for something in particular.
The Mount Vernon Trail is located just across the river from Downtown Washington, DC and is a great multi-use recreation trail. The recreational trail is nearly 18 miles long and it follows the Potomac's Virginia shoreline from Theodore Roosevelt Island to George Washington's Estate located at Mount Vernon. The excellent scenery and consistently well-maintained condition of this paved surface makes the Mount Vernon Trail a favorite of cyclists, hikers and runners.
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.