Grayscale After
I made picture black and white using the HSL/Grayscale panel and clicking convert to grayscale. The image looked a little flat and dark so I went to the basics panel and started by increasing exposure. Next I moved up the contrast slider to give it a little life. I then adjusted the white and black points making sure they didn’t clip. Next I sharpened the castle using the adjustment brush to bring out the stones and cracks a little bit more. The shadows were a bit dark so I adjusted the shadows slider some.