Base of Fort Lovrijenac in Kolorina Bay, Dubrovnik, Croatia (© Barbara Vallance/Getty Images)

Moraine Lake in Banff National Park, Alberta, Canada (© Schroptschop/Getty Images)

Aerial view of blue and white parasols on the rocky coast of Rhodes, an island in Greece (© Amazing Aerial Agency/Offset by Shutterstock)

Cape foxes in the Kalahari Desert, South Africa (© NSP-RF/Alamy)

Independence Day fireworks over the National Mall, Washington, DC (© Jon Bilous/Shutterstock)

Great Point Light on Nantucket Island, Massachusetts (© Cate Brown/Cavan Images)

Tolbachik volcanic complex on the Kamchatka Peninsula, Russia (© Egor Vlasov/Shutterstock)

Enhanced-color composite of the Caloris Basin, Mercury (© NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington)

Gray seal pup resting on a beach in Blakeney National Nature Reserve, England (© Kevin Sawford/Getty Images)

American Basin in southern Colorado's San Juan Mountains (© Blaine Harrington III/Alamy)

The bell tower in Lake Reschen, South Tyrol, Italy (© Scacciamosche/Getty Images)

Bàu Cá Cái mangrove forest in Quảng Ngãi province, Vietnam (© Robert Harding World Imagery/Offset)

Ežezers Lake in the Latgale region, Latvia (© Eaglewood Films/Nimia)

The Hoh Rainforest in Olympic National Park, Washington state (© Jorge Romano/Offset by Shutterstock)

The Panthéon in Paris, France (© manjik/Shutterstock)

The flooded crypt at Winchester Cathedral, Hampshire, England (© Oliver Hoffmann/Alamy)

North Pacific humpback whale breaching in Frederick Sound, Alaska (© Tony Wu/Minden Pictures)

Happy hot air balloon (© Leonsbox/Getty Images Plus)

Nine-spotted moth in Switzerland (© Thomas Marent/Minden Pictures)

The Grand Canal and Basilica di Santa Maria della Salute in Venice, Italy (© Jim Richardson/Offset by Shutterstock)

Earthrise across Mare Smythii on the moon (© Image Science and Analysis Laboratory, NASA-Johnson Space Center)

The town of Dinant and the River Meuse in Namur province, Belgium (© Kadagan/Shutterstock)

Blue wildebeest herd migrating at sunset, Maasai Mara National Reserve, Kenya (© Denis-Huot/Minden Pictures)

Elephants at Kapama Private Game Reserve in South Africa (© Simon Eeman/Getty Images)

Disko Bay, Ilulissat, Greenland (© Kertu/Shutterstock)

Frank Gehry's BP Pedestrian Bridge connecting Millennium Park and Maggie Daley Park in Chicago (© Devon Neff/Shutterstock)

Tamul waterfall in the state of San Luis Potosí, Mexico (© Robert Harding World Imagery/Offset by Shutterstock)

Hamelin Pool Marine Nature Reserve in Australia (© Abstract Aerial Art/Getty Images)

Kalsoy Island, one of the Faroe Islands (© Swen Stroop/Getty Images Plus)

Hamerkop standing on a hippo, Mana Pools National Park, Zimbabwe (© David Fettes/Getty Images)

Sand Harbor, Lake Tahoe Nevada State Park, Nevada (© Mariusz Blach/Getty Images Plus)