Salisbury Crags in Holyrood Park overlooking Edinburgh, Scotland (© Andrew Merry/Getty Images)

Mesas, Upper Cathedral Valley, Capitol Reef National Park, Utah (© Tim Fitzharris/Minden Pictures)

Ornate wall at the Qutb Minar complex in New Delhi, India (© Peter Zelei Images/Getty Images)

Clouded leopard (© Dhritiman Mukherjee/Alamy)

The Sky Pool at Embassy Gardens in London, England (© Xinhua News Agency/Getty Images)

Salt cones on the Salar de Uyuni, Bolivia (© John Shaw/Minden Pictures)

Elizabeth Quay Bridge in Perth, Australia (© Amazing Aerial Agency/Offset by Shutterstock)

Early morning view of Taj Mahal in Agra, India (© Adrian Pope/Getty Images)

The Mine Bay Māori Rock Carving of Ngatoroirangi by Matahi Whakataka-Brightwell on Lake Taupo, North Island, New Zealand (© Evgueni Zverev/Alamy)

The Perseid meteor shower photographed at the Dinosaur Museum of Erenhot in Inner Mongolia, China (© bjdlzx/Getty Images)

African bush elephant herd, Okavango Delta, Botswana (© Juan-Carlos Munoz/Minden Pictures)

Horned ghost crab, Grand Anse, Praslin Island, Seychelles (© Ingo Schulz/Offset by Shutterstock)

Ubehebe Crater in Death Valley National Park, California (© Albert Knapp/Alamy)

National flag hoisted at Red Fort in New Delhi, India (© Roop_Dey/Shutterstock)

Silhouette of Shambhala roller coaster at sunset in PortAventura Park, Salou, Tarragona, Spain (© Joaquim F. P./Getty Images)

Stairway to Heaven Trail in Wawayanda State Park, New Jersey (© Leembe/Getty Images)

The Old Town of Dubrovnik, Croatia (© Jeremy Woodhouse/Getty Images)

Giant manta ray and a photographer off the Ningaloo Coast, Australia (© Shutterstock Premier)

Rub' al Khali desert on the border of Oman and the Emirate of Dubai (© Daniel Schoenen/Offset by Shutterstock)

Petit Minou Lighthouse in the roadstead of Brest, Finistère, France (© Mathieu Rivrin/Getty Images)

The shoreline of Olympic Coast National Marine Sanctuary, Washington state (© Chris Moore/Tandem Stills + Motion)

The chhatris of Orchha in Madhya Pradesh, India (© PEDRE/iStock/Getty Images Plus)

Old surfboards lined up as a fence near Paia, Maui, Hawaii (© Matt Anderson Photography/Getty Images)

Peekaboo view of Angels Window on the North Rim of the Grand Canyon, Arizona (© Tim Fitzharris/Minden Pictures)

A sea swallow feeding on the tentacles of a blue button in Coffs Harbour, New South Wales, Australia (© Gary Bell/Minden Pictures)

Casa do Penedo (House of the Rock) in Portugal (© Olimpio Fantuz/eStock Photo)

Red-billed oxpeckers on an impala in Mpumalanga, South Africa (© Heini Wehrle/Minden Pictures)

Underground lake in Ruskeala Mountain Park, Karelia, Russia (© Konstantin Trubavin/Offset by Shutterstock)

Ancient architecture of Sri Krishna Temple ruins in Hampi, India (© Images of India/Alamy Stock Photo)

Đurđevića Tara Bridge in Montenegro (© Hike The World/Shutterstock)

A porcini mushroom (© vnosokin/Getty Images)