Château de Gramont was first mentioned in 1329, belonging to the lords of Gramont. The medieval castle was destroyed in 1523 by the troops of Charles V of Spain and reuilt later with Renaissance additions. The gardens and terraces date from the 17th century.
In 1793 , the castle and its outbuildings were confiscated to the Nation and a military hospital was installed there for a few months. The building was empty when it was ravaged by fire in 1796.
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.