Riddarfjärden
Riddarfjärden (, "The Knight Firth") is the easternmost bay of Lake Mälaren in central Stockholm. Stockholm was founded in 1252 on an island in the stream where Lake Mälaren (from the west) drains into the Baltic Sea (to the east); today the island is called Stadsholmen and constitutes Stockholm's Old Town.
General Industrial Exposition of Stockholm (1866)
The General Industrial Exposition of Stockholm (1866) (Swedish: "1866 års allmänna industriutställning i Stockholm") or only the Stockholm Exposition of 1866 (Swedish: "Stockholmsutställningen 1866") was an international aviation exhibition held in the Swedish capital of Stockholm. 
It was the first international Art- and Industrial Exposition held after a European pattern in Sweden. Circa 3.800 people from Sweden, Denmark, Norway and Finland participated. The exposition was took place in the Industrial Hall at Kungsträdgården and at the Nationalmuseum on Blasieholmen in Stockholm between the 15 June and the 14 October 1866.