Monarch butterflies wintering in Michoacán, Mexico (© Sylvain Cordier/Getty Images)

Cork tree forest (© Andrés M. Domínguez/Minden)

Workers cleaning the clock face of Big Ben in London, England, for the end of Daylight Saving Time (© Reuters)

Mount Diablo State Park, California, USA (© Yuval Helfman/Getty Images)

Camels gather with their herders at the Pushkar Camel Fair, Rajasthan (© Anand Purohit/Getty Images)

Saffron flowers in Spain (© Juan-Carlos Munoz/Minden Pictures)

Jardin des Tuileries in autumn leading to the Louvre Museum in Paris, France (© Brian A. Jackson/Getty Images Plus)

Chapel St-Michel d'Aiguilhe, Le Puy-en-Velay, France (© Jaubert French Collection/Alamy Stock Photo)

The Brandenburg Gate seen through a heart-shaped replica of the Berlin Wall (© Britta Pedersen/picture alliance via Getty Images)

Jama Masjid in Champaner, Gujarat (© Tilak Haria/Getty Images)

Wildflowers in the mist on Mount Howitt in Alpine National Park, Victoria, Australia (© Australian Scenics/Photolibrary/Getty Images Plus)

Nihangs performing the Gatka in celebration of the 300th year of consecration of the Guru Granth Sahib, Maharashtra (2008). (© Dinodia Photo/age fotostock)

Rodrigo Koxa riding the biggest wave ever surfed, on Nov 8, 2017, off the coast of Nazaré, Portugal (© Pedro Cruz/AP Photo)

The 'Crown of Light' installation is projected onto Durham Cathedral during the 2013 Lumiere Durham festival in England (© Stuart Forster/Alamy)

Starlings at sunset in Blackpool, England (© Mediaworld Images/Alamy)

Fog shrouds the Bavarian Alps in Germany (© Anton Petrus/Getty Images)

For the 30th anniversary of Czechoslovakia's Velvet Revolution, bridges over the Vltava River, including the Charles Bridge and Old Town Bridge Tower, Prague, Czech Republic (© Markus Lange/Offset)

Manatees in the Ichetucknee River in Florida, USA. (© Jennifer Adler/Alamy)

Fall colours in Zion National Park, USA (© pabradyphoto/Getty Images)

Gelada monkeys in Simien Mountains National Park, Northern Ethiopia (© Marco Gaiotti/plainpicture)

Lantignié in the Beaujolais region of France (© Jon Arnold/Danita Delimont)

The Cutty Sark in Greenwich, London, England for her 150th anniversary (© Grant Rooney Premium/Alamy)

For Fibonacci Day, an agave plant (© Moab Republic/Shutterstock)

A cypress in the Atchafalaya Basin, Louisiana, USA (© Chris Moore/Tandem Still + Motion)

Highland cattle in Drenthe province in the Netherlands (© defotoberg/Shutterstock)

Kanchenjunga, on the India-Nepal border, among a sea of clouds at sunrise (© Alexander W Helin/Getty Images)

Las Catedrales beach, Galicia, Spain (© Davide Seddio/Getty Images)

Frost on blueberry plants, New Brunswick, Canada (© Freeman Patterson/Masterfile)

Jemaa el-Fnaa Square in Marrakesh (© Pavliha/Getty Images)

Aurora Australis over the Halley VI Research Station in Antarctica (© Stuart Holroyd/Alamy)