"It was forgotten," said Sascha Keil, a spokesman for the group Unterwelten, or Underworlds, which specializes in digging out Berlin's buried history.
Nazi's dream found buried under rubble in Berlin →
"They don't want to know," said Mr. Keil. "They didn't even want to mark the Fuehrer Bunker [where Hitler spent his final days in 1945]. We did that at our own expense."