NANJING -- More than 1 million visitors have visited an exhibition on the history of the Nanjing Massacre in Nanjing city, capital of East China's Jiangsu province, authorities said Monday.

The exhibition was held at the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders and featured 2,000 historical photos and over 900 cultural items.

Lu Hailin from Jiangning district in Nanjing was the millionth visitor to the exhibition. He wrote in the visitor guestbook, "Never forget the past and it will guide your future."

Lu's young son Lu Yiqi said, "I can understand the explanations and I will come back next time."

The exhibition opened to the public on Dec 14, 2017.

On Dec 13, 1937, Japanese troops began six weeks of destruction, pillage, rape and slaughter in Nanjing. More than 300,000 Chinese, including unarmed soldiers and innocent civilians, were murdered.