In PS CS2 I added a brightness/contrast adjustment layer to your photo and adjusted the contrast to +40.
I then created a mask for the layer by clicking that little square icon with a white circle in it at the bottom of the layers window.
I made sure I had the new mask selected by clicking it in the layers window and then painted on the church with a black brush.
The mask will only allow the adjustment layer to affect the photo where the mask is white. The black part of the mask will not let the adjustment layer shine through to the photo.