Algerian Ambassador's Residence
Most of the foreign embassies in Seoul are located near the central core of the city -- Jongno-gu and Jung-gu in particular. However, if you walk around the hilly area of Seongbuk-gu in northern Seoul you can find many of the ambassador's private residences. I was there two weeks ago following my most recent trip to the Gansong Art Museum and the first one I saw was for the Ambassador of Kazakhstan - funny coincidence - but all told I probably came across at least two dozen ambassadorial homes.
The area is pretty quiet; the only people I saw outdoors were a couple of kids playing in the courtyard of the Papua New Guinean ambassador's residence and a woman scolding a young boy - complete with a stern look and finger-wagging - at the Afghan ambassador's place.