It has almost 2,000 hotel rooms and 600,000 sq. The Gaylord National Resort and Convention Center is the East Coast’s largest non-gaming hotel and convention center. National Harbor is home to two of Maryland’s Four Diamond rated hotels. The iconic Capital Wheel-a 180-ft observation wheel-offers guests unprecedented views of DC, Maryland and Virginia. The vibrant Waterfront District at National Harbor features boutique shops, restaurants and entertainment options along the picturesque promenades.