The Smithsonian National Museum of Natural History boasts the world's largest natural history collection that will inspire several "oohs' and "aahs" from visitors of all ages. Among the highly dramatic and memorable exhibits are a 70 million-year-old dinosaur egg, an incredible giant squid, and a look at a truly unforgettable tarantula feeding that will inspire several gasps among all who view it. In addition to all of these exhibits, the museum offers even more adventures via the 3-D IMAX theater within its facility.
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.
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.