The location of the 1979 Iranian Hostage Crisis which held 52 Americans hostage for 444 days. The hostage crisis began November 4, 1979 and lasted until January 20, 1981. The U.S. has not had a physical embassy in Iran since 1979.
Latitude (decimal)
35.708
Longitude (decimal)
51.424
Source
Suggested by Mount Desert Island Historical Society.