There are so many I like. This is a very well known one, and justifiably.
http://www.djclark.com/godwin/landmarks/im06/index.html

What I like most about her landscapes is the way she captures the 'spirit' of the land, and the sense of it's ancient history. I like her other documentary and portrait work too - simple and effective. Lots of work available on the website.
Cate