Salt flats in San Francisco Bay

Edinburgh city skyline at night, Scotland

Farmers collecting water lilies in the Satla marshland near Bagdha, Barisal, Bangladesh

Red-necked grebes in Germany

The Hickman Bridge at Capitol Reef National Park, Utah

An active lava tube, Hawai'i Volcanoes National Park, Hawaii

Noctilucent clouds in Lithuania

Rainforest hike near Milford Sound/Piopiotahi in New Zealand

Tigresses of Telia Lake in Tadoba Andhari Tiger Reserve, India

Longs Peak in Rocky Mountain National Park, Colorado

Nabataean tomb in Mada'in Saleh (aka Hegra), Saudi Arabia

Mangrove forest in the Saloum Delta National Park, Senegal

Golden Gallopers Carousel on the seafront in Brighton, East Sussex, England

Amelia Earhart teaching students in Newark, New Jersey

Elephant hawk-moth on foxglove flower

Our Lady of the Rocks and Saint George Island in the Bay of Kotor, Perast, Montenegro

Abbey Gardens in Bury St Edmunds, Suffolk, England

Composite photo showing the phases of the moon

Male American bison in Yellowstone National Park, Wyoming

Omijima Island in Kita-Nagato Kaigan Quasi-National Park, Japan