cool boulder trips to franconia and catalunya.
simon marsden is a photographer who works with infrared. his pictures are looking very mysticly and strange.
jens klatt is a professional photo-grapher and takes photos to various topics in colour and black&white.
it's a beautiful page about caves, karst and photography from max wisshak. he studied geology and in his sparetime he explores caves.
here are some more photos from max. this page is more in general about geology, but has less information.