Polar bears asleep in Canada (© David Pike/Minden Pictures)

Suspension bridge in Tambopata National Reserve, Amazon Basin, Peru (© Pere Rubi/Getty Images)

Hoodoos at Bryce Canyon National Park, Utah (© Piriya Photography/Getty Images)

Mandarin duck, Richmond Park, London, England (© Oscar Dewhurst/Minden Pictures)

Paris, France (© somchaij/Shutterstock)

Freedom Sunday rally, Soldier Field, Chicago, Illinois, July 10, 1966 (© Bettmann/Getty Images)

French Quarter, New Orleans, Louisiana (© f11photo/Getty Images)

Washington Monument and Capitol Building on the National Mall, Washington, DC (© AevanStock/Shutterstock)

Humpback whales, Maui, Hawaii (© Flip Nicklin/Minden Pictures)

Eben Ice Caves, Upper Peninsula, Michigan (© Dean Pennala/Shutterstock)