This picture stood out to me from the start mainly due to the brightness of the sky. However, I felt that the blue of the sky took away from the detail of the castle.

 

From the start I knew that I wanted to try out Silver Efex Pro 2 on this picture because I felt that it would bring more detail to the castle. These are the steps that I took to achieve the final results:

 

1- Open the image in Camera Raw

2- Choose Len Correction (6th icon from the left)

3- Clicked "Open Image"

4- Went to Filter>Nik Software>Silver Efex Pro 2

5- From the presets I chose "High Structure (smooth)

6- From there, I played around with the Brightness, Contrast, Structure, Shadows and Highlights settings

 

Over all I was really happy with the end results because I felt like the castle had more detail and was the focal point of the picture.