201 Waterfront St.
National Harbor, MD 20745
This 2,000-room hotel opened in 2008. The 19-story glass-and-steel tower has 2,000 guest rooms and 470,000 square feet of meeting space. It is the second-largest indoor convention space in the city. Highlights include a full-service marina, a large spa, and four signature restaurants, including a rooftop lounge.4. The Gaylord National also books events at its RiverView terrace, its new 15,000-square-foot venue along the Potomac River available seasonally from April through October.