My three favorites are the remote and beautifully preserved Burg Eltz, the ruined but powerful Rheinfels, and the 19th-century fantasy of Neuschwanstein. Thanks to smart diplomacy and clever marriages, Burg Eltz was never destroyed. The first burg (castle) on the Eltz creek was built in the 12th century to protect a trade route. Rheinfels Castle, both much mightier and much more ruined, lords over its bend in the nearby Rhine River. After Bavarians complained about the money Ludwig spent on castles, his sanity was questioned.