Many pictures are featured in the Daily Mail article about the National Geographic travel photography contest. The last one they provide, taken in Glacier National Park, is particularly outstanding.
Breathtaking entries - National Geographic Travel Photographer of the Year contest
Here's the link to the actual contest site. This is the last week to enter. There are some great shots
in the entire collection of submissions.
Here's another fine entry, the Erta Ale lava lake, Ethiopia: