Detail of Old Town Clock on Town Hall at Old Town Square, Stare Mesto, Prague, UNESCO World Heritage Site, Czech Republic, Europe

Historical books at Strahov Monastery, Hradcany, Prague, Czech Republic, Europe

A murmuration of starlings, numbering well over a million birds, flock together to roost at dusk on the Avalon Marshes at Shapwick Heath Nature Reserve in Somerset

A murmuration of starlings, numbering well over a million birds, form the shape of an atomic bomb mushroom cloud as they come in to roost at dusk on the Avalon Marshes at Shapwick Heath Nature Reserve in Somerset

A murmuration of starlings, numbering well over a million birds, gather as a flock to roost at dusk on the Avalon Marshes at Shapwick Heath Nature Reserve in Somerset

Via dell'Abbondanza, the main ancient city street with stones and house numbering, Pompeii, UNESCO World Heritage Site, Campania, Italy, Europe

Marked stones in a restoration projects at the Ancient ruins of Ta Prohm Temple, Angkor, Siem Reap, Cambodia

King penguin (Aptenodytes patagonicus) courtship in a colony of nesting animals numbering between 70,000 and 100,000 nesting pairs on Salisbury Plain on South Georgia Island, South Atlantic Ocean.

King penguin (Aptenodytes patagonicus) pair in colony of nesting animals numbering between 70,000 and 100,000 nesting pairs on Salisbury Plain on South Georgia Island, South Atlantic Ocean.

King penguin (Aptenodytes patagonicus) pair in colony of nesting animals numbering between 70,000 and 100,000 nesting pairs on Salisbury Plain on South Georgia Island, South Atlantic Ocean.

Adult King penguin (Aptenodytes patagonicus) in colony of nesting animals numbering between 70,000 and 100,000 nesting pairs on Salisbury Plain on South Georgia Island, South Atlantic Ocean.

King penguin (Aptenodytes patagonicus) courtship near colony of nesting animals numbering between 70,000 and 100,000 nesting pairs on Salisbury Plain on South Georgia Island, South Atlantic Ocean.

King penguin (Aptenodytes patagonicus) pair courtship in colony of nesting animals numbering between 70,000 and 100,000 nesting pairs on Salisbury Plain on South Georgia Island, South Atlantic Ocean.

King penguin (Aptenodytes patagonicus) (head detail) colony of nesting animals numbering between 70,000 and 100,000 nesting pairs on Salisbury Plain on South Georgia Island, South Atlantic Ocean.

King penguin (Aptenodytes patagonicus) colony of nesting animals numbering between 70,000 and 100,000 nesting pairs on Salisbury Plain on South Georgia Island, South Atlantic Ocean.

King penguin (Aptenodytes patagonicus) colony of nesting animals numbering between 70,000 and 100,000 nesting pairs on Salisbury Plain on South Georgia Island, South Atlantic Ocean.

Three king penguins (Aptenodytes patagonicus) near colony of nesting animals numbering about 7,000 nesting pairs at Fortuna Bay on South Georgia Island, South Atlantic Ocean.

King penguin (Aptenodytes patagonicus) colony of nesting animals numbering between 70,000 and 100,000 nesting pairs on Salisbury Plain on South Georgia Island, South Atlantic Ocean.

King penguin (Aptenodytes patagonicus) colony of nesting animals numbering around 7,000 nesting pairs in Fortuna Bay on South Georgia Island, South Atlantic Ocean.

King penguins (Aptenodytes patagonicus) walking on the beach near a colony of nesting animals numbering about 7,000 nesting pairs at Fortuna Bay on South Georgia Island, South Atlantic Ocean.

King penguins (Aptenodytes patagonicus) walking on the beach near colony of nesting animals numbering about 7,000 nesting pairs at Fortuna Bay on South Georgia Island, South Atlantic Ocean.