Sentence:  The shelter illustrated in figure 12 is based on such a room built in a new home in the <WSD>Washington</WSD> , D. C. area in the Spring of 1959 . 
Meaning of the word marked with <WSD> tags:  the capital of the United States in the District of Columbia and a tourist mecca; George Washington commissioned Charles L'Enfant to lay out the city in 1791