Three-toed sloth in Costa Rica (© Harry Collins/Getty Images)

Wind River, Brooks Range, Arctic National Wildlife Refuge, Alaska, USA (© Design Pics/DanitaDelimont)

Loch Morlich, Cairngorms National Park, Scotland (© Arterra/Universal Images Group/Getty Images)

Jupiter's icy moon Europa (© NASA/JPL-Caltech/SETI Institute)

African elephants in Tsavo East National Park, Kenya (© Neil Bowman/Minden Pictures)

Cottonwoods through an arch in Coyote Gulch, Glen Canyon Recreation Area, Utah, USA (© Stephen Matera/TANDEM Stills + Motion)

The Elbphilharmonie concert hall in Hamburg, Germany (© Canetti/Shutterstock)

Mototi octopus, Lembeh Strait, Indonesia (© Howard Chew/Alamy Stock Photo)

Aspens near Marble, Colorado, USA (© Jason Hatfield/TANDEM Stills + Motion)

Sorano, Tuscany, Italy (© Luigi Vaccarella/eStock Photo)

Grasmere, Lake District, Cumbria, England (© joe daniel price/Moment/Getty Images)

Wood duck, Quebec, Canada (© Maxime Riendeau/Getty Images)

Courtyard of the Maidens, Alcázar of Seville, Spain (© Danny Lehman/Getty Images)

Coco Beach, Goa, India (© Abhinav Sah/Shutterstock)

Great wildebeest migration at Mara River, Kenya (© Ayzenstayn/Getty Images)

Fossils of belemnites and ammonites, Jurassic Coast, Dorset, England (© Nature Picture Library/Alamy Stock Photo)

Kochia, Ibaraki Prefecture, Japan (© DigiPub/Getty Images)

Autumn in Central Park, Manhattan, New York, USA (© mapman/Shutterstock)

Temple of Hathor, Dendera Temple Complex, Qena, Egypt (© Nick Brundle Photography/Getty Images)

Cypress trees in George L Smith State Park, Georgia, USA (© Chris Moore/TANDEM Stills + Motion)

Palazzo Zuccari, Rome, Italy (© Photon-Photos/Getty Images)

Madame Sherri Forest and the remnant of an old castle, New Hampshire, USA (© yggdrasill/Shutterstock)

Bodie State Historic Park, Mono County, California, USA (© Julien McRoberts/Tetra Images, LLC/Alamy Stock Photo)

Mont Blanc in Chamonix, France (© Simon Schöpf/Getty Images)

Gespensterwald, Nienhagen, Mecklenburg-West Pomerania, Germany (© mauritius images GmbH/Alamy Stock Photo)

The Balmoral Clocktower, Edinburgh (© Puthipong Worasaran/Moment/Getty Images)

Pumpkin field, Victoria, British Columbia, Canada (© Shaun Cunningham/Alamy Stock Photo)

Great horned owl (© Mark Newman/Getty Images)

View of Edinburgh Castle from a churchyard in Scotland (© Chris Dorney/Alamy Stock Photo)

Chimera of Notre-Dame de Paris, France (© scaliger/Getty Images)