German photographer Michael Poliza traveled by helicopter to capture the extraordinary landscapes of the Rift Valley in Kenya and Ethiopia from the air

NYC photographer finds abstract beauty in the polluted Brooklyn waterway

Thought-provoking aerial photos of suburban development in America

Project aims to transform LA billboards into aerial gardens

Aerial photos of the Ivanpah solar thermal plant by Jamie Stillings

Big surprise: Portland is number one

Aerial perspectives from Phillip Kalantzis Cope

The most explosive volcano photos of 2011, courtesy of The Atlantic