The realm of ancient giants
Giant sequoias, Sequoia National Park, California (© Galyna Andrushko/Shutterstock)

The realm of ancient giants
Giant sequoias, Sequoia National Park, California (© Galyna Andrushko/Shutterstock)

Flying colors
Blue-throated toucanet, Los Quetzales National Park, Costa Rica (© Oscar Dominguez/Tandem Stills + Motion)

Flying colors
Blue-throated toucanet, Los Quetzales National Park, Costa Rica (© Oscar Dominguez/Tandem Stills + Motion)

Above the floating city
Aerial view of the Grand Canal and the Basilica di Santa Maria della Salute, Venice, Italy (© Bachir Moukarzel/Amazing Aerial Agency)

Above the floating city
Aerial view of the Grand Canal and the Basilica di Santa Maria della Salute, Venice, Italy (© Bachir Moukarzel/Amazing Aerial Agency)

Golden glimpses
Cottonwoods seen through an arch in Coyote Gulch, Glen Canyon Recreation Area, Utah (© Stephen Matera/Tandem Stills + Motion)

Golden glimpses
Cottonwoods seen through an arch in Coyote Gulch, Glen Canyon Recreation Area, Utah (© Stephen Matera/Tandem Stills + Motion)

Connecting Connecticut
West Cornwall Covered Bridge over the Housatonic River, Connecticut (© pabradyphoto/Getty Images)

Connecting Connecticut
West Cornwall Covered Bridge over the Housatonic River, Connecticut (© pabradyphoto/Getty Images)

Go with the floe
Herd of walruses in northern Spitsbergen, Svalbard archipelago, Norway (© AWL Images/Danita Delimont)

Go with the floe
Herd of walruses in northern Spitsbergen, Svalbard archipelago, Norway (© AWL Images/Danita Delimont)

Dome sweet dome
Last light on Half Dome, Yosemite National Park, California (© Adam Burton/Alamy)

Dome sweet dome
Last light on Half Dome, Yosemite National Park, California (© Adam Burton/Alamy)

Wind River's wild dance
Wind River, Brooks Range, Arctic National Wildlife Refuge, Alaska (© Design Pics/Danita Delimont)

Wind River's wild dance
Wind River, Brooks Range, Arctic National Wildlife Refuge, Alaska (© Design Pics/Danita Delimont)

Grand gesture of love
Taj Mahal in Agra, Uttar Pradesh, India (© Tanarch/Getty Images)

Grand gesture of love
Taj Mahal in Agra, Uttar Pradesh, India (© Tanarch/Getty Images)

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

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

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