The castle belonged to vassals of feudal state Bishopric of Ösel-Wiek - Western part of nowadays Estonia as well as part of Saaremaa and part of Hiiumaa. It was built in 15th century, but didn't last for a long. It was destroyed already in 16th century. Now the ruined walls are few metres high, but it really looks that there is almost nothing. That's because grass and bush is growing on the ruins. It is located near the sea on the left side of the road (if coming from port) some 200 m behind the petrol station. You can see on this page how the castle once looked: http://www.virtsu.ee/ajalugu/linnus.html.