Inspired by D.C.’s grand architecture, MGM National Harbor features visually-striking designs, from the massive plinth constructed from precast concrete and the curtain-wall system of the hotel tower to the composite metal porte cochère greeting visitors. Situated on the shores of the Potomac River and only minutes from Washington, D.C., stands the MGM National Harbor, a gleaming $1.4 billion, 23-acre, 300-guest hotel casino resort complex.