Ossenmarkt Fort, locally known as Fort aan de Ossenmarkt (which literally translates to Fort at the Oxmarket), lies in the town of Weesp, in the province of North Holland in the Netherlands.
Ossenmarkt Fort is a small tower fort built in 1861. It was part of the Weesp Fortress which itself became part of the Defence Line of Amsterdam in 1901. In 1876 the east side of the fort was equipped with a earthen glacis which partially filled in the moat.
In the late 1940's the fort was used as a mushroom farm until the 1950's when it definitely lost its military function. Later it was also used as a practice location for the local fire brigade.
In 1976 Ossenmarkt fort was bought by the local government. In the 1980's the earthen glacis was removed and later the fort was restored to its original appearance.
At present the fort is used for cultural and commercial purposes. It can only be visited on special occasions, which I still have to go to because I am very curious how its interior looks.