All over Germany and throughout Europe, there is an over-abundance of spectacular castles, palaces and fortification that are nearly impossible to fully catalogue or visit at a full-modern pace.
Just up the road is the town of Bad Liebenstein, named for an impressive castle ruin perched above the spa community, and nestled in the valley below among other villas and summer homes of the cadet branches of the former ruling families is Schloss Altenstein. This noble idyll also hosted Luther when he initially fled the Diet of Worms before taking refuge in the Wartburg and saw some of the first and significant mingling of the royal houses of Germany and England. Princess Adelheid of Saxony-Meiningen and later Queen of Great Britain (namesake of Adelaide Australia) spent her childhood here.
Still back- tracking with Martin Luther, we come to the great citadel of the city of Erfurt. This fortification with its expansive and intact bastions and ravelins forms one of the largest inland garrisons in Europe. Not hugging a coast and surrounded by the city (though inspired by the megalithic works of the French fort architect and engineer Marquis de Vauban), it is hard to appreciate the scale of this structure. Of course, Erfurt, among many other things, is connected with Luther as his theological alma mater and in whose cathedral he was ordained after seminary. The Benedictine cloister that originally occupied the grounds of Petersburg became, before the defensive bulwarks were built, an important centre of the counter-reformation.