- This tour operator offers an unusual and memorable way to see D.C. by land and water, without changing vehicle. Passengers board authentic, fully restored 1942 Ducks, amphibious military personnel carriers. The land tour begins at Union Station and includes the National Mall, the monuments and the Smithsonian museums before the Duck splashes into the Potomac River. A scenic river cruise follows, with the 90-minute tour ending at Gravely Point beneath the flight path of landing planes at National Airport.
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