Rock 'n' bowl
Sunset on Bowling Ball Beach, Mendocino County, California (© Melo Qiao/Getty Images)

Rock 'n' bowl
Sunset on Bowling Ball Beach, Mendocino County, California (© Melo Qiao/Getty Images)

Bouncing into creativity
The RedBall Project art installation, Centraal Station, Antwerp, Belgium (© Brit Worgan/Getty Images)

Bouncing into creativity
The RedBall Project art installation, Centraal Station, Antwerp, Belgium (© Brit Worgan/Getty Images)

Sundown on Union Square
Union Square in lower Manhattan at twilight, New York (© Sean Pavone/Getty Images)

Sundown on Union Square
Union Square in lower Manhattan at twilight, New York (© Sean Pavone/Getty Images)

Have I been sleeping too long?
American black bear cub in spring, Shenandoah National Park, Virginia (© Scott Suriano/Getty Images)

Have I been sleeping too long?
American black bear cub in spring, Shenandoah National Park, Virginia (© Scott Suriano/Getty Images)

Wall of fame
Medieval city walls, Ávila, Spain (© Alberto Loyo/Getty Images)

Wall of fame
Medieval city walls, Ávila, Spain (© Alberto Loyo/Getty Images)

History has come full circle
The Ring of Brodgar, Orkney, Scotland (© Paul Williams - FunkyStock/Getty Images)

History has come full circle
The Ring of Brodgar, Orkney, Scotland (© Paul Williams - FunkyStock/Getty Images)

Preserve, protect, enjoy!
Grand Prismatic Spring at sunrise, Yellowstone National Park, Wyoming (© XIN WANG/Getty Images)

Preserve, protect, enjoy!
Grand Prismatic Spring at sunrise, Yellowstone National Park, Wyoming (© XIN WANG/Getty Images)

The road not taken
Sparks Lane in Cades Cove, Great Smoky Mountains National Park, Tennessee (© Richard Bernabe/Shutterstock)

The road not taken
Sparks Lane in Cades Cove, Great Smoky Mountains National Park, Tennessee (© Richard Bernabe/Shutterstock)

What are we shell-ebrating?
Green sea turtle, San Diego, California (© Ralph Pace/Minden Pictures)

What are we shell-ebrating?
Green sea turtle, San Diego, California (© Ralph Pace/Minden Pictures)

Fully booked!
Library of Trinity College Dublin, Ireland (© Vincent Isore/Getty Images)

Fully booked!
Library of Trinity College Dublin, Ireland (© Vincent Isore/Getty Images)

很高兴在这里见到你们！
南极洲冰山上的阿德利企鹅 (© Patrick J. Endres/Getty Images)