An ice palace or ice castle is a castle-like structure made of blocks of ice. These blocks are usually harvested from nearby rivers or lakes when they become frozen in winter. The first known ice palace (or, rather, ice house, ледяной дом in Russian) appeared in St. Petersburg, Russia, when Anna Ivanovna, Empress of Russia, commissioned an ice palace in St. Petersburg, Russia, during the winter of 1739–40. Architect Piotr Eropkin and scientist Georg Wolfgang Krafft used huge ice blocks measuring 16 m (52 ft) long by 5 m (16 ft) wide, joined together with frozen water, to build the palace. The city recreates the ice palace every winter.[1]