Nathan Siemers' site http://fiveprime.org, has some BEAUTIFUL photographs! The creator behind Flickr Hive Mind is used by thousands daily to explore http://www.flickr.com/, the photography database that I know, love, and use just as daily. Besides this, he also works as a director of research at a pharmaceutical company and is a cellist. Very versatile! Below (as well as above) are my favorites that members of Flickr have on the fiveprime site.