historical centers. the city brags 11 the 19 smithsonian galleries, including the national air and space exhibition hall, gallery of national history, national historical center of american history thus some more.
the best occasions to visit washington, d.c., are from september to november and walk to may. in the pre-winter, the sweltering summer is gone, taking with it the greater part of the high season voyagers. all that is left are fresh breezes and evolving leaves, which, coincidentally, look extraordinary against every one of those marble landmarks.
the answer is the letter m, found 1 time in minute, two times in moment and zero times in thousand year.