Neuschwanstein Castle is the world's most famous castle, built by King Ludwig II of Bavaria in the 19th century as a fantastical retreat. Perched on a mountain in the Bavarian Alps 120km from Munich, it inspired the Disney castle design. The castle can only be visited on 30-minute guided tours in German or English, with audio guides available in 18 languages. Book tickets weeks in advance especially during peak season (June-August). Entry is free for visitors under 18.