First I correct the lines, reducing the inclination of the building. I made a little crop on the left side. Finaly I selected the sky and reduce the intensity the blue to a more clear blue, to enhance the monastery fašade.
Add a bit more sharpness.
To increase the dramacity and add more terror to this old house, using photoshop I first used the channel mixer and changed the photo to monochrome.
Then put blue in -200% and increased both red and green for better contrasts.
Then I corrected levels, contrast and brightness.
After that I add the thick black border to make it more oppressive and finaly put a title name a little bit different from the original one using a font to bring some oldness to mind.