Looks like HDR technique for sure. Check out this link:
http://en.wikipedia.org/wiki/High_dynamic_range_imaging
This is a n amazing image, the atmosphere is brilliant, & the colours & mood... I love it... has this been PhotoShopped? If you don't mind me asking?
HDR Definitely and possibly Photoshopped a lil here and there to bring out the photo atmosphere
OK - this is how I did it...
The original shot, straight out of the camera, looked like this
(It's a Welsh castle, where my cousin got married)
I opened it up in Camera Raw (part of Photoshop CS3) and most of the look came from wild and extravagant use of the faders...almost like turning everything up to 10...
Recovery, Fill Light, Blacks, Contrast and Clarity all boosted to 100 and even more contrast added with the Tone Curve - then I needed to cut the Exposure, dropping it to -1.25
Vibrance pushed to 100, but Saturation cut to -70
And this was the result
These settings will make a lot of photos look terrible, but I liked the effect I was getting here.
To finish it off I opened it in Photoshop. I cloned out the blown out bit of sky in the top left hand corner, then used 3 filters: Fresco, Watercolour and Diffuse Glow. Fresco and Watercolour were to add a bit of texture and Diffuse Glow was to bring out the light in the sky.
I only wanted the merest hint of each one, so I used fairly subtle settings and applied them to duplicate layers, setting the Blend Mode to Darken, with 10% Opacity for Fresco and Watercolour and 20% Opacity for Diffuse Glow...