Highlights: Ljubljana Castle was built in the 11th century AD on the top of Castle Hill in the capital of Slovenia, surrounded by a beautiful forest. The castle was a wooden structure in the early days. Because of its geographical location and the military strategic significance represented by the Castle Hill, it has always been a military fortress. In the 15th century, the Harps royal family rebuilt the castle to defend against the Turks. Gothic-style churches and paintings. Among them, St. George's Chapel was built in 1489, and other buildings were built in the 16th and 17th centuries. From the 19th century to the end of World War II, it was converted into a prison. During World War II, it was used to hold Italian and German prisoners of war.