OFFERING a glimpse into the past, a mash-up of old and new photographs show how the world’s biggest cities have changed. A new phone app allows users to travel back in time by overlaying vintage images, such as London's Tower Bridge in 1892 or the Eiffel Tower in 1940, with how the locations look today. Users can compare the past and present of cities such as London, Paris, Washington and Saint Petersburg. This window to the past was created English entrepreneur David Webb, 45, the creator and CEO of the Timera app.
A pair of adorable polar bear cubs play-fight with each other in the Alaskan snow .
Like a scene from a fairytale, THOUSANDS of fireflies create an enchanting glow as they dance in a forest .
Armed with a snorkel, flippers and her skimpy bikini, an intrepid female free diver swims alongside an array of reef sharks .
MASKED intruders look sinister but really they are a gang of urban exploring pranksters .
This brave Hyena finally catches his pray among the thousands of flamingos, Lake Nakuru, Kenya - OUTNUMBERED among thousands of flamingos, this bold hyena is not put off from hunting for a morning snack .
From vivid greens to glowing pinks, the colours of the aurora borealis fill the night sky above a snow covered Lapland .
A lazy tree frog, tired of hopping along a branch, chooses the slowest form of transport when it jumps on top of an unsuspecting snail .
SWIMMING slowly towards the shore, a small group of bottlenose dolphins arrive for breakfast at a beach in Western Australia .
WITHOUT A care in the world, this little snow monkey puts his feet up and settles in for a snooze .
BALANCING 30 metres above ground, these slackliners take the expression of living dangerously one step further, by tightrope walking NAKED .
ROLLING up snow in its tiny paws, this little squirrel is looking for a snowball fight .