The sun sets in Lucerne, Switzerland beside the silhouetted watchtower of a city wall.

A lone flower nestled among tree branches sprouts soft pink petals in Tsavo West National Park, Kenya.

A baboon looks contemplative as it sits behind a barricade of sticks and branches in Amboseli National Park, Kenya.

These soft pink blooms in Tsavo West National Park, Kenya contain a sunburst at their centre, like a bulls-eye for insects on the hunt for pollen.

A small herd of fallow deer sample the thorn bushes in Tsavo West National Park, Kenya, hiding in the tall grasses with their natural camouflage.

A camouflaged lizard watches its surroundings carefully in Amboseli National Park, Kenya.

An intricate yellow blossom stands alone on a muted green background in this shot from Nairobi, Kenya.

A glowing sunset silhouettes the distinctive shapes of the elephant and acacia tree on the African plain. The clear yellow disc of the sun provides a bright spot of focus to counter the imposing image of the elephant that seems to be watching the sunset itself.

A tangle of pale green lichen speckled with dew and frost near Lima, Peru.

The majestic alps dominate the foreground and inhabit the background of this high-altitude image at Mount Pilatus near Lucerne, Switzerland.

A colony of ants makes its way along a vine branch, perhaps in search of new food, or traveling between nests. Shot in Puerto Maldonado, Peru.

A view of Italian architecture framed by the arches of an arcade, Venice, Italy.

The brilliant setting sun obscures the mountaintops and rocks surrounding Machu Picchu, Peru, washing the craggy vista with golden light.

Spots of dew glisten on this complex, layered pink flower. Taken in Lima, Peru.

The sunset casts long shadows and crisp sunbeams on the rich brown mountainsides of Ollantaytambo, Peru.

Tree bark featuring chalky white fungal growths, giving additional texture and colour to the rough brown surface - from Puerto Maldonado, Peru.

The appearance of this strange tree branch suggests it could be from an alien world or the imagination of an artist. In reality, it is from a "Camel Thorn" acacia tree native to Africa.

A lizard takes a break to warm itself on a sunny rock, looking pensive and wary despite its camouflage.