Swedish conquerors established a sea fortress named Rågövik (“Rye Island Bay”) to the deep and wind-sheltered Paldiski Bay in the 17th century. Later it became a Russian naval base in the 18th century. Peter the Great planned to build a giant military port of there. The plan envisaged that the mole would offer shelter for the entire vast navy of Russia. Construction of the military port started in 1716. Despite the efforts of thousands of convicts, the planned 2-km-long giant facility could not be completed and even the completed part was quite soon destroyed by autumn storms.
In 1762, the Russians (Catherine II) renamed the sea fortress of Rogerwiek into Baltiyskiy Port (Baltic Port), and the Estonian pronounciation, Paldiski, became the official name in 1933. In 1962, Paldiski became a Soviet Navy nuclear submarine training centre. With two land-based nuclear reactors, and employing some 16,000 people, it was the largest such facility in the Soviet Union. Because of its importance, the whole city was closed off with barbed wire until the last Russian warship left in August 1994. Russia finally relinquished control of the nuclear reactor facilities in September 1995.
Frösöstenen is the northern-most raised runestone in the world and Jämtland's only runestone. It originally stood at the tip of ferry terminal on the sound between the island of Frösön and Östersund. The stone dates to between 1030 and 1050. It has now been relocated to the lawn in front of the local county seat due to the construction of a new bridge, between 1969 and 1971, on the original site.
Frösö runestone inscription means: Austmaðr, Guðfastr's son, had this stone raised and this bridge built and Christianized Jämtland. Ásbjörn built the bridge. Trjónn and Steinn carved these runes.