Washington, D.C. Exploring

Best Place to Pay Respect: Arlington National Cemetery (Arlington; tel. 703/607-8000) is the final resting place of those who sacrificed to ensure the greatness of this nation. Presidents, Supreme Court justices, explorers, soldiers, and historical figures are among those buried here. Don't miss the changing of the guard at the Tomb of the Unknown Soldier; it's an impressive spectacle that's free to watch.

Best Place to Learn Everything: The epicenter of nearly everything known to man, the Library of Congress (101 Independence Ave. SE; tel. 202/707-5000) holds an adventure's worth of information for any visitor. The hour-long tours at this, the largest library in the world, are free.

Best Place to Imagine the Possibilities: Exploration's final frontier can only be reached through the air, so any explorer in Washington, D.C. should visit the National Air and Space Museum (Independence Ave. at 6th St. SW; tel. 202/633-1000), one of the Smithsonian's most popular attractions. Admission is free.

Best Place to be Overwhelmed: The depths of hatred are on display at the United States Holocaust Museum (100 Raoul Wallenberg Pl. SW; tel. 202/488-0400). Each fascinating trip through this powerful place ensures, it is hoped, future goodwill among humans; the free admission aims at a priceless goal.

Best Real Estate Tour: If the buyer's market has you spending weekends at open houses, a stop at the world's most famous address should help you recognize quality architecture. If you've made advance reservations, you can get a free group (10 or more) tour at the White House (1600 Pennsylvania Ave. NW; tel. 202/456-7041).