Grizzly bear cub siblings playing in Denali National Park and Preserve, Alaska (© Ron Niebrugge/Alamy)(Bing United States)

[20210410] - 'Grizzly bear cub siblings playing in Denali National Park and Preserve, Alaska (© Ron Niebrugge/Alamy)(Bing United States)'

Square Tower Group in Hovenweep National Monument, Utah (© Brad McGinley Photography/Getty Images)(Bing United States)

[20210409] - 'Square Tower Group in Hovenweep National Monument, Utah (© Brad McGinley Photography/Getty Images)(Bing United States)'

Black grouse male calling at a lek site in Kuusamo, Finland (© Oliver Smart/Alamy)(Bing United States)

[20210408] - 'Black grouse male calling at a lek site in Kuusamo, Finland (© Oliver Smart/Alamy)(Bing United States)'

Willow tree in early spring, Minnesota (© Jim Brandenburg/Minden Pictures)(Bing United States)

[20210407] - 'Willow tree in early spring, Minnesota (© Jim Brandenburg/Minden Pictures)(Bing United States)'

The Acropolis of Athens, Greece (© Lucky-photographer/Shutterstock)(Bing United States)

[20210406] - 'The Acropolis of Athens, Greece (© Lucky-photographer/Shutterstock)(Bing United States)'

Saut du Brot stone bridge in the Areuse Gorge, Neuchâtel, Switzerland (© Andreas Gerth/eStock Photo)(Bing United States)

[20210405] - 'Saut du Brot stone bridge in the Areuse Gorge, Neuchâtel, Switzerland (© Andreas Gerth/eStock Photo)(Bing United States)'

An Ostereierbaum (Easter egg tree) in Saalfeld, Germany (© Rudi Sebastian/Alamy)(Bing United States)

[20210404] - 'An Ostereierbaum (Easter egg tree) in Saalfeld, Germany (© Rudi Sebastian/Alamy)(Bing United States)'

Lighthouse at Cape Aniva, Sakhalin Island, Russia (© Amazing Aerial Agency/Offset by Shutterstock)(Bing United States)

[20210403] - 'Lighthouse at Cape Aniva, Sakhalin Island, Russia (© Amazing Aerial Agency/Offset by Shutterstock)(Bing United States)'

Shopping on Amazon.com to support us with hosting and bandwidth costs