15 of nature's most spectacular shows

Bio-luminescence in the tide makes walking along the beach on Vaadhoo Island in the Maldives especially magical. The light is emitted from tiny plankton in the water. The Monarch Butterfly Biosphere Reserve in Mexico's Michoacan state is a winter home to tens of millions of butterflies. The aurora borealis lights up the night sky in Lofoten, Norway.

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