Embassy Row is the informal name for a street or area of a city where
embassies or other diplomatic installations are concentrated. The
best-known of these is in Washington, D.C.. The area where the foreign
Embassy’s are now congregated was considered Washington's premier
residential address in the late 19th and early 20th centuries.
Massachusetts Avenue, in particular, became known for its numerous
mansions housing the city's social and political elites. The title photo
is of the Luxembourg Embassy.