May 14 2010

Canada, United States, New Zealand

White Cliffs Area of the Upper Missouri Breaks National Monument on the Lewis and Clark Trail, Montana
Tom Trill/Superstock/Photolibrary ©

Australia, Japan

The Dust of the Cat's Eye Nebula
STScI/NASA/Corbis ©

Germany

A Female Sea Otter Floats with a Newborn Pup Resting on Her Chest in Prince William Sound, Alaska, U.S.
Steven Kazlowski/Corbis ©

United Kingdom

The Big Room in Carlsbad Cavern, Carlsbad Caverns National Park, New Mexico, U.S.
David L. Brown/Photolibrary ©

China

Signs Post Forest, Near Watson Lake, Alaska, U.S.
Don Johnston/Getty Images ©

May 13 2010

China

May Summer: The First Summer I still SD, Grass Has No Rest: Shamrock Sign
Boris Roessler/epa/Corbis ©

Japan

The Music Hall, Izumo Shrine, Shimane, Japan
JTB Photo/Photolibrary ©

Australia, Germany

White Cliffs Area of the Upper Missouri Breaks National Monument on the Lewis and Clark Trail, Montana
Tom Trill/Superstock/Photolibrary ©

Canada, United States, New Zealand

Clown Triggerfish off the Coast of Bunaken Island, Sulawesi, Indonesia
Georgette Douwma/Getty Images ©

United Kingdom

Iguazu Falls, Parana, Brazil
SIME/eStock Photo ©