Mikkeli Cathedral was built in 1896-1897. The large red-brick church is designed by Finnish church architect Josef Stenbäck. It represents the Gothic Revival style like many other churches designed by Stenbäck. The bell tower is in the western gable of the church. The church has 1,200 seats. The organ was built in 1956 by Kangasala Organ Factory and has 51 stops. The altar painting "Crucified" was made by Pekka Halonen in 1899.
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.