Just 12 miles from Dulles International Airport and 45 minutes from Washington D.C., The National Conference Center is one of the largest conference and learning centers in the nation. Our unique in-house team of multi-media experts, culinary specialists and event planners can transform our 265,000 square feet of space into your ideal learning and development program, team building, training session or event. The National's all-inclusive property is complete with 250 meeting rooms, 917 guest rooms, an 880-seat dining room, and the largest ballroom in Northern Virginia, accommodating up to 1,800 guests. The National Conference Center's expansive complex offers customizable GSA-certified space located on 39 acres along the Potomac River.