Celadon Laboratories Inc

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.

Referred to as "America's attic," the National Museum of American History offers an unprecedented collection of items that numbers to nearly three million entries. Everything from Dorothy's ruby red slippers, to one of the first Kermit the Frog puppets, to Julia Child's kitchen, to an astounding 34-foot Star Spangled Banner, are just a few of the numerous highlights. The kids will love the interactive displays, especially the ones that encourage invention and creativity.

Ford's Theatre has a built-in drama all its own. This is where John Wilkes Booth shot President Abraham Lincoln, and that unsettling episode still resonates in the structure today. Take a tour that retraces the incident, and you can also get a look at some of the interesting backstage areas. And if you are visiting for a performance, the excellent acoustics and inviting seating arrangement will ensure that whether you are watching a play or a musical production, the entertainment takes on a deeper significance when you consider that you are sitting within some truly historic walls.