Cross-section of a fossilized ammonite shell (© Marianna Armata/Getty Images)

The sculpture 'Kindred Spirits' by Alex Pentek in Bailick Park, Midleton, County Cork, Ireland (© David Creedon/Alamy Live News/Alamy)

Marigolds decorate a cemetery in Patzcuaro, Michoacan, Mexico, for a Day of the Dead ceremony (© Daniel Elizalde S/Shutterstock)

Moon jelly and golden jellyfish, Raja Ampat, West Papua, Indonesia (© Alex Mustard/Minden Pictures)

Lanterns illuminated for the Diwali festival, Mumbai, India (© RAMNIKLAL MODI/Shutterstock)

Pont Rouge (Red Bridge) over the Palmer River in Sainte-Agathe-de-Lotbinière, Quebec, Canada (© Jean Surprenant/Getty Images)

Female numbat in Brookton, Western Australia (© Martin Willis/Minden Pictures)

Mack Arch Rock at sunrise on the southern Oregon coast (© Dennis Frates/Alamy)

Polar bear investigating a camera, Churchill, Manitoba, Canada (© Matthias Breiter/Minden Pictures)

Ancient rock tombs carved into the cliff near Dalyan, Turkey (© Reinhard Schmid/eStock Photo)

Cumberland Island National Seashore, Georgia (© Wilsilver77/Getty Images Plus)

Sailors on the amphibious assault ship USS Iwo Jima on New York's Hudson River during Veterans Week, 2016 (© Apple White/Alamy)

Beavers Bend Resort Park near Broken Bow, Oklahoma (© Inge Johnsson/Alamy)

Aerial view of El Tajo gorge and the Puente Nuevo bridge in Ronda, Málaga, Spain (© Jude Newkirk/Amazing Aerial Agency)

First Cliff Walk on First near Grindelwald, Switzerland (© Hans-Georg Eiben/eStock Photo)

Manatee in Florida (© Paul E Tessier/Cavan Images/Offset by Shutterstock)

The Jacobite steam train crossing the Glenfinnan Viaduct in Inverness-shire, Scotland (© The Escape of Malee/Shutterstock)

Boardwalk Trail at Corkscrew Swamp Sanctuary in Florida (© Bill Gozansky/Alamy)

Bohemian Switzerland National Park near Tisá, Czech Republic (© Amazing Aerial Agency/Offset)

The Subway slot canyon in Zion National Park, Utah (© Stan Moniz/Tandem Stills + Motion)

'A New Breath' by artist Saype in Moléson-sur-Gruyères, Switzerland (© Valentin Flauraud/Shutterstock)

Forest near the village of Invergarry, Scotland (© Matt Anderson Photography/Getty Images)

Irohazaka road near Nikkō, Japan (© LightRecords/Shutterstock)

Chocolate Hills in Bohol, Philippines (© Danita Delimont/Offset by Shutterstock)

Red squirrels in Cairngorms National Park, Highlands, Scotland (© Scotland: The Big Picture/Minden Pictures)

Zuni Olla Maidens at the annual Inter-Tribal Ceremonial in Gallup, New Mexico (© Julien McRoberts/Danita Delimont)

Aerial view of Penn Station and the New York City skyline at night in the 1950s (© R. Gates -Staff/Getty Images)

Centennial Bridge towering above Soberanía National Park, Panama (© David Tipling/Universal Images Group via Getty Images)

Aerial view of snowy peaks of Vinicunca (aka Rainbow Mountain), Peru (© Jude Newkirk/Amazing Aerial Agency)

African bush elephants at Masai Mara National Reserve in Kenya (© Yva Momatiuk and John Eastcott/Minden Pictures)