Belgrade

Belgrade was visited by a Yugoslavian circus troupe that included an amnesiac Hercules Panhellenios and a stranded Hawkeye. When they reached the city, Hawkeye phoned (reverse-charge) the Avengers Mansion and, not getting an answer, contacted Kevin O'Brien, who was happy to help Hawkeye and Hercules go back to the United States in a plane from Belgrade.^[1]

Alternate Realities

Earth-1610

Arthur Molekevic was born and spent some of his formative years in Belgrade when it was under the auspices of Yugoslavia.^[2]