Living in Germany it would have been indeed easy to find a building that is not only 100 years old but several hundreds. Close to my hometown, they found the foundations of a Roman estate dating back to the second century AD. But I decided to show the Wachenburg, one of the two castles overlooking Weinheim an der Bergstraße, in Germany. It looks like a Romanesque castle (the roof received new tiles a few years ago) but it is little over 100 years old. The main buildings were constructed between 1907 and 1913 by a Corps of former students (more information on these student fraternities can be found here) to serve as a memorial for members who had died during the Franco-Prussian war of 1870/71 and a location for their yearly meetings. Family lore has it that my grandfather worked on the roof gutters as a young tinsmith.
For the A Photo a Week Challenge: over 100 years old. For more old photos click here.