Located at 14th Street and Pennsylvania Ave NW, the Willard Hotel is arguably the most historically saturated hotel in all of Washington DC, and is a must-see for any American history buff, big or small. From the late 1840 until now, the Willard Hotel has been home to everyone from Lincoln to Mark Twain Ulysses Grant, Calvin Coolidge, John Philip Sousa, Martin Luther King and more. Home to Peacock Alley and one of the oldest bars in town, the Round Robin, where many a politician and foreign dignitary have been sighted. Designed by architect Henry Hardenbergh, the same man who designed New York's Plaza Hotel.