Had Lord Vader once been on this planet too? If so when and what did he do to get adorned on this building that has only been around 100 years? These questions and many more may come to mind when you finally find and see him here.
To find him look at the coordinates on google maps or whatever you would like and go to the building and find the best spot to view it.
To log the cache:
Take a photo of you standing with the Darth Vader side of the cathedral behind you, obviously if you are alone just do a headshot or gps and Darth Vader.