Seven natural wonders of the world

Soldotna, Alaska: The aurora borealis, or northern lights, fill the early morning sky Photograph: M Scott Moon/Peninsula Clarion/AP

Arizona: A view into the Grand Canyon from the southern rim. More than 4 million people visit the site every year Photograph: Robyn Beck/AFP

Zimbabwe: A rainbow forms in a cloud of mist from the Zambezi river at Victoria Falls Photograph: John Moore/AP

Queensland, Australia: An aerial view of the Great Barrier Reef Photograph: Queensland Tourism/AP

China: Everest, the world's tallest mountain Photograph: Suolang Luobu/Xinhua/AP

Mexico: Lava bursts from Paricutin volcano Photograph: Corbis

Rio de Janiero: A view of the city and Christ the Redeemer by Paul Landowski Photograph: Corbis