As a symbol of peace and in the memory of those who died, there are several monuments in Japan keeping alive the flame ignited by the atomic bomb. This is not a figure of speech, the flame was indeed taken after it was ignited by the bombing and it was kept alive until today! Here's the story:
On August 6th, 1945, when the bomb exploded, Tatsuo Yamamoto was in a train near Hiroshima, on his way to a military base. His uncle was running a bookstore on the Hondōri street (in the center of Hiroshima), so Tatsuo went there, searching for his uncle. But he found the house destroyed and a flame was still burning... With that flame, he lit a portable warmer and took it home, in the Hoshino-mura village from Fukuoka.
Tatsuo Yamamoto kept the flame burning, inside the family shrine and in a kamado (a traditional Japanese stove) until 1968, when the existence of the flame became public and the flame was transferred inside a monument.
From there, the flame was taken to 14 places in Japan. One of them is the monument from the Toshougu Shrine in Ueno, Tokyo, and I found another one in Ofuna, near the great Kannon statue.
Here, the flame is lit inside the stone lantern from this photo, installed in 1990 by the Kanagawa Association of A-bomb Sufferers:
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 20mm
Aperture: F/5.6
Shutter Speed: 1/800s
ISO Sensitivity: ISO 200