![Viljandi Castle](https://www.xwhos.com/photo/whois_viljandi_castle_profile_2170320.webp)
Viljandi Castle
Viljandi castle of Livonian Order, construction of which started 1224 in place of a former hillfort, was one of the strongest castles in Livonia. Finally destroyed in the Polish-Swedish wars in the early 17th century, ruins of it now form a popular resort area in Viljandi, Estonia.