Almarestäket's castle

[2] A castle was built during the 12th century on Stäketsholmen (which was then an island), and served as a defense facility for the cities of Sigtuna and Uppsala.

In 1440, Archbishop Nils Ragvaldsson received permission to build a new castle, which was completed about ten years later.

[3] During the domestic political strife of the 1510s, the bishop Gustav Trolle held the castle, which was besieged by his main opponent Sten Sture the Younger in 1516–17.

In 1517, despite the threat of excommunication, Sten Sture enforced a decision of the Riksdag that the castle should be demolished.

Below the hill is an approximately five-meter high obelisk in red granite that was built in 1804, as well as the remains of the adjacent bridge over the Almarestäket.