Bonilla de la Sierra castle has three wall sections and three turrets of different styles and origins. The main par of the castle was formed by the Tower of Homage, of the 14th century, it has matacanes and round arches, and under the tower is the main yard and the rooms. The castle contains 14th-century paintings.
It was the resting place of the prelates of the Ávila bishopric, and held important episcopal synods, as the one in 1384. Bishop Sancho Dávila had a wall built around the village in the 14th century.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.