Outside of Washington, DC, and Alexandria, VA, across the Potomac River, resides the gorgeous waterfront development of National Harbor, MD. From the highway, a multicolored, spiked sculpture guides you toward the center of this manmade metropolis. Once a plantation was built in the 1800s, a fire destroyed it, and the property was put up for sale in the 1980s. A resort area that resembles a movie set for an idyllic city, it features hotels, stores, restaurants, a marina, and points of interest – all within walking distance in one neat,…