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Yinlianzhui Waterfall near Anshun, Guizhou Province, China

A grey wolf in Yellowstone National Park, Wyoming

A helter skelter ride decorated with St George and the Dragon in Plymouth, Devon

'A Holi festival in Washington, DC

A meerkat in its natural environment

African jacana chick in Chobe National Park, Botswana

African wild dogs in Kruger National Park, South Africa

An adult black bear in the Tongass National Forest of Alaska

An elevated trail at Cradle Mountain-Lake St Clair National Park in Tasmania, Australia

Arctic fox kits on Wrangel Island, Russia

Astronaut Terry Virts takes a selfie in space

Blanchard Springs Caverns in Arkansas

Civita di Bagnoregio, Italy

Lacy's Caves on the banks of River Eden near Little Salkeld, Cumbria

Crepuscular rays over the Saronic Gulf, Greece

Desert View Watchtower, Grand Canyon National Park, Arizona

Blanchard Springs Caverns in Arkansas

Earth seen from space

'Equinox at the Salk Institute for Biological Studies, San Diego, California

European rabbit

Five Fingers Strand near Malin Head, Ireland

Fresh water and salt water mix at the Ter River estuary near L'Estartit, Spain

Ground nest in the Arctic National Wildlife Refuge, Alaska

Hveravellir hot spring on Kjölur plateau, Iceland

Ice in a lava tube at Lava Beds National Monument, California

Interior of the Broch of Mousa on Mousa island, Scotland

Kallur lighthouse on Kalsoy Island, Faroe Islands

Kilchurn Castle on Loch Awe in Argyll and Bute, Scotland

Kuha Karuhas pavilion in Phraya Nakhon Cave, Thailand

Lacy's Caves on the banks of River Eden near Little Salkeld, Cumbria

Lamplugh Glacier in Glacier Bay National Park and Preserve, Alaska

Lands End in San Francisco, California

Mirror Beach near Trancoso, Bahia, Brazil

Monument Valley in Arizona and Utah

On the Slovenian side of the Julian Alps

Organ pipes in St Giles' Church, Wrexham, Wales

Scarlet rosefinch male perching

Springtime near the village of Aínsa-Sobrarbe, Spain

Stair Hole near Lulworth Cove in Dorset

Stawa Młyny beacon in Świnoujście, Poland

Springtime near the village of Aínsa-Sobrarbe, Spain

Sunrise over Hadrian's Wall at Steel Rigg in Northumberland

Svalbard Satellite Station, Svalbard archipelago, Norway

The diving gondola on Sellin Pier, Germany

The Crescent Dunes Solar Energy Project near Tonopah, Nevada

The diving gondola on Sellin Pier, Germany

The Old Man of Storr on the Isle of Skye, Scotland

Titanic Belfast; a maritime museum in Belfast; Northern Ireland

Wallace Hut and snow gum trees in Alpine National Park, Victoria, Australia

Weaver birds in Queen Elizabeth National Park, Uganda