Sunrise over Pisgah National Forest in North Carolina

Anchorage, Alaska

Yosemite Highlands in July

Quinalt Rainforest, Olympic National Park

The colourful sandstone formations at White Pocket, AZ

Maelstrom!

Volcano Anak Krakatau

Cave of three bridges

Blue Caves, Zakynthos, Greece

Lizard Island, Australia

Bristle Cone Pine Forest, White Mountains, California

Old Man's Cave Ohio, US

Danxia landform - Zhangye, Province of Gansu, China