Photo of Metallurgy Day in Norilsk (IMAGE) U.S. National Science Foundation Caption This is a celebration of Metallurgy Day in Norilsk: the largest city on permafrost above the Arctic Circle. Credit Dmitry Streletskiy, George Washington University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.