St. Mary's Church was built in the 12th century and it was enlarged a century later. The bell tower was added in Late Middle Ages and the church has been restored and rebuilt several times. The are eight medieval stone sculptures in the facade. The baptismal font is as old as the building itself. The Renaissance style pulpit dates from the 1600s.References:
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.