Burg Nanstein, a castle located in Landstuhl, Germany, was built by Holy Roman Emperor Frederick Barbarossa in 1162. This castle was built to protect the western approach to Kaiserslautern, a very old settlement at the edge of the Pfälzerwald (Palatinate forest).
Nanstein castle was also home to the famous German knight Franz von Sickingen. One of the early supporters of the Reformation, Sickingen offered this castle as a shelter for Martin Luther and other reformers after the Diet of Worms.
We visited Burg Nanstein during out 2007 visit to Germany and the Kaiserslautern area. It is a wonderful old castle with an amazing view of Landstuhl. You can see the different eras of building by the varying stones. The growth of ivy and small trees in the walls lends a feeling of ancient decay. This is a great place to visit if you are visiting the Rhineland.