Nicastro's origins trace back to the 9th century, when Calabria was part of the Byzantine Empire, when a fortress called Neo Castrum ('New Castle') was created. In 1057, the area was conquered by the Normans, but Nicastro revolted against Robert Guiscard and his brother Roger. Having dominated the revolt, the new nobiliary had the castle built, which was restored in the 13th century by Frederick II of Swabia. It served as the place of imprisonment of Frederick II's son Henry.
The castle was destroyed by the disastrous earthquake of 1638 and lies today in ruins.
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.