Tynnelsö estate was first mentioned in 1282. Since 1306 it belonged to the Diocese of Strängnäs. During the 1490s bishop Kort Rogge built the first stone castle and the first floor is still the original. In 1522 Tynnelsö was acquired by Gustav Vasa and it belonged to the royal family until 1636, but was again later returned to the crown (during the Great Reduction in 1681). The current square-formed castle was built to the present appearance in the 1590s. In the 18th century Tynnelsö castle was abandoned and left to decay. The major restoration was made in 1826-1827.
Today the castle is closed due the restoration, which should be started in future. The surrounding garden includes lot of lime trees and a villa built in 1876.
References:The Broch of Clickimin is a large and well preserved, though somewhat restored broch near Lerwick. Originally built on an island in Clickimin Loch (now increased in size by silting and drainage), it was approached by a stone causeway. The water-level in the loch was reduced in 1874, leaving the broch high and dry. The broch is situated within a walled enclosure and, unusually for brochs, features a large 'blockhouse' between the opening in the enclosure and the broch itself. Another unusual feature is a stone slab featuring sculptured footprints, located in the causeway which approached the site. Situated across the loch is the Clickimin Leisure Centre.