Acoustic sound panels in the ceiling of the Royal Albert Hall, London (© chrisstockphotography/Alamy)(Bing Australia)

Cliff dwelling at Canyon De Chelly National Monument in Arizona (© Design Pics/Offset)(Bing Australia)

Small island cays west of Great Exuma Island in the Bahamas photographed from the International Space Station (© NASA)(Bing Australia)

Crested pigeon in Uluru-Kata Tjuta National Park, Australia (© Shutterstock)(Bing Australia)

Hong Kong, China (© Banana Republic Images/Shutterstock)(Bing Australia)

A harbour seal near Islay, Scotland (© Laurie Campbell/Minden Pictures)(Bing Australia)

The Berlin Cathedral illuminated during the Festival of Lights in Berlin, Germany (© Paul Zinken/Alamy)(Bing Australia)

Fog over Sofia, Bulgaria (© Ivan Dimitrov/Solent News/REX/Shutterstock)(Bing Australia)

Testing mirror segments for the James Webb Space Telescope (© NASA)(Bing Australia)

A yellow-fronted woodpecker in Brazil (© Rafael Guadeluppe/Getty Images)(Bing Australia)

Mountain trail in Madeira, Portugal (© Rusinka/Shutterstock)(Bing Australia)

Zuiderduintjes in the West Frisian Islands, Netherlands (© Pete Leonard/Getty Images)(Bing Australia)

Granite rocks off Flinders Island, Tasmania (© Aurora Photos/Masterfile)(Bing Australia)

Iron Canyon Trail near Park City, Utah (© Patrick Brandenburg/Tandem Stills + Motion)(Bing Australia)

A boat in the Ganges River at Varanasi, India (© David Santiago Garcia/Aurora Photos)(Bing Australia)

Greater flamingos in Tanzania (© DLILLC/Corbis/VCG Getty Images)(Bing Australia)

Sunset on Hạ Long Bay, Vietnam (© Banana Republic Images/Shutterstock)(Bing Australia)

Limestone cliffs in Foradada, Catalonia, Spain (© Inaki Relanzon/Minden Pictures)(Bing Australia)

Messner Mountain Museum in the Clouds on Monte Rite, Italy (© Alberto Simonetti/Getty Images)(Bing Australia)

Mount Tarawera on the North Island, New Zealand (© Look Foto/Aurora Photos)(Bing Australia)

Saxon Switzerland National Park, Germany (© Andreas Vogel/500px)(Bing Australia)

Wicker fields near Cuenca, Spain (© David Santiago Garcia/Aurora Photos)(Bing Australia)

Gypsum claypans in Francois Peron National Park, Western Australia (© Yann Arthus-Bertrand/Getty Images)(Bing Australia)

Female greater kudu in Chobe National Park, Botswana (© WorldFoto/Aurora Photos)(Bing Australia)

Mist across the Transylvanian countryside in Romania (© Alex Robciuc/REX/Shutterstock)(Bing Australia)

Eruption of Eyjafjallajökull at Fimmvörðuháls Pass in Iceland (© moodboard/Cultura/Getty Images)(Bing Australia)

An African leopard in the Londolozi Private Game Reserve, South Africa (© Sergey Gorshkov/Minden Pictures)(Bing Australia)

Phyllidia coelestis, a sea slug (© Jurgen Freund/Aurora Photos)(Bing Australia)

A haunted graveyard (© Shutterstock/Getty Images)(Bing Australia)

Mural of sugar skull (calavera) in Oaxaca, Mexico (© Judy Bellah/Alamy)(Bing Australia)