Bridging history, one arch at a time
Ribblehead Viaduct and Ingleborough mountain, North Yorkshire, England (© AWL Images/DanitaDelimont.com)

Bridging history, one arch at a time
Ribblehead Viaduct and Ingleborough mountain, North Yorkshire, England (© AWL Images/DanitaDelimont.com)

A walk among the clouds
Golden Bridge, Bà Nà Hills, Da Nang, Vietnam (© Hien Phung Thu/Shutterstock)

A walk among the clouds
Golden Bridge, Bà Nà Hills, Da Nang, Vietnam (© Hien Phung Thu/Shutterstock)

Baa, baa, black sheep? No.
Scottish Blackface sheep, Aberdeenshire, Scotland (© Mike Powles/Getty Images)

Baa, baa, black sheep? No.
Scottish Blackface sheep, Aberdeenshire, Scotland (© Mike Powles/Getty Images)

Reflections of a nation's legacy
Archway Islands, Wharariki Beach, South Island, New Zealand (© Francesco Vaninetti/AWL/plainpicture)

Reflections of a nation's legacy
Archway Islands, Wharariki Beach, South Island, New Zealand (© Francesco Vaninetti/AWL/plainpicture)

Stuck in a blue moment
Blue hour in Trondheim, Norway (© Jeanny Mueller/Getty Images)

Stuck in a blue moment
Blue hour in Trondheim, Norway (© Jeanny Mueller/Getty Images)

Frozen in time
Medieval towers in Mestia, Upper Svaneti, Georgia (© photoaliona/Getty Images)

Frozen in time
Medieval towers in Mestia, Upper Svaneti, Georgia (© photoaliona/Getty Images)

A point worth pondering
Alstrom Point, Lake Powell, Utah (© T.M. Schultze/TANDEM Stills + Motion)

A point worth pondering
Alstrom Point, Lake Powell, Utah (© T.M. Schultze/TANDEM Stills + Motion)

Under my umbrella
Art installation of umbrellas at Borough Market in London, England (© Malcolm P Chapman/Getty Images)

Under my umbrella
Art installation of umbrellas at Borough Market in London, England (© Malcolm P Chapman/Getty Images)

The watchful eyes of history
Yungang Grottoes, Datong, Shanxi province, China (© Eric Yang/Getty Images)

The watchful eyes of history
Yungang Grottoes, Datong, Shanxi province, China (© Eric Yang/Getty Images)

Darwin's blueprint
Marine iguanas, Galápagos Islands, Ecuador (© helovi/Getty Images)

Darwin's blueprint
Marine iguanas, Galápagos Islands, Ecuador (© helovi/Getty Images)

Salt of the earth
Lake Tyrrell, Victoria, Australia (© Monica Bertolazzi/Getty Images)