Between 1612 and 1615, Salzburg’s prince-archbishop Markus Sittikus commissioned the building of a summer residence at the foot of Hellbrunn mountain, a location already abundant in naturally flowing waters. Based on Italian models and in a relatively short period of time, an architectural jewel had been created, still reckoned amongst the most magnificent Renaissance buildings north of the Alps. Hellbrunn was only meant for use as a day residence in summer, as the Archbishop usually returned to Salzburg in the evening, therefore, there is no bedroom in Hellbrunn.
The schloss is also famous for its jeux d'eau ('watergames') in the grounds, which are a popular tourist attraction in the summer months. These games were conceived by Markus Sittikus, a man with a keen sense of humour, as a series of practical jokes to be performed on guests. Notable features include stone seats around a stone dining table through which a water conduit sprays water into the seat of the guests when the mechanism is activated, and hidden fountains that surprise and spray guests while they take part on the tour. Other features are a mechanical, water-operated and music-playing theatre built in 1750 including some 200 automata showing various professions at work, a grotto and a crown being pushed up and down by a jet of water, symbolising the rise and fall of power. At all of these games there is always a spot which is never wet: that where the Archbishop stood or sat, to which there is no water conduit and which is today occupied by the tour guide.
Towering 52 meters above the sea, Bengtskär lighthouse is the tallest one in Scandinavia. The building started in in 1905 after the shipwreck of S/S Helsingfors and was completed in 1906. The lighthouse was designed by architect Florentin Granholm. On December a special petrol lantern, designed and built in Paris, was brought to Bengtskär and installed atop the tower.
German fleet bombarded Bengstkär in the First World War in 1914. Since the Gulf of Finland was heavily mined, it was not until 1919 that the surrounding seas were declared safe for shipping, that the light was lit again.
After the war the military value of Bengtskär increased as part of the defence system of independent Finland. In Second World War (1941) Soviet Union made a suprise attack to island. After a bloody battle, the small Finnish garrison emerged victorious. Intermittent repairs to the facility continued during the post-war period.