09-14Ruby-throated hummingbird feeding on yellow bells in the Texas Hill Country - Rolf Nussbaumer/Danita Delimont)
09-13Sand dunes with Sangre de Cristo Mountains in the background, Great Sand Dunes National Park and Preserve, Colorado - Tim Fitzharris
09-11One World Trade Center and lower Manhattan, seen from the Empty Sky memorial in Jersey City, New Jersey - Maurizio Rellini/Offset by Shutterstock)
09-10Huay Mae Khamin waterfall in Khuean Srinagarindra National Park, Thailand - ImpaKPro/Getty Images)
09-09A bearded reedling in Elmley National Nature Reserve in Kent, England - Mark Bridger/Offset by Shutterstock)
09-07A worker painting the Hammering Man, a sculpture by Jonathan Borofsky, in Frankfurt, Germany - Arne Dedert/Alamy)