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Want to know where all the money comes from? Then get set to find out on one of Washington, DC's most popular tours when you visit the Bureau of Engraving and Printing. Some of the exhibits include bills that are no longer in circulation, counterfeit money and a staggering $100,000 bill, along with a presentation of how money is produced and printed. In keeping with fiscal responsibility, the tour is actually free but during peak summer months, admission tickets are given out on a first-come, first-served basis.

Considered by many to be the ultimate must-see museum in DC, the United States Holocaust Memorial Museum is nothing short of an emotional and educational experience. When you arrive, you are given an "identity card" of a real Holocaust victim that deeply personalizes your trip through the various exhibits. You'll view an astounding collection of film clips, photographs, artifacts and unflinching first-hand accounts. There's even an exhibit for the kids that treats the subject matter in a highly sensitive manner; this exhibition will inspire questions and answers that will no doubt lead to a better understanding of this horrible passage in our world's history.

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.

The Potomac River offers several fine opportunities for water sports and great aquatic fun. Enjoy a day of sailing and get a look at DC from a truly amazing vantage point. There are several marinas on the Southwest Waterfront, Old Town Alexandria, and Arlington that are great starting points for your time on the water. Lessons are available at the Washington Sailing Marina which is located just south of the Reagan National Airport.