London Visitor

Onlookers keep a watch for the whale in the River Thames.  (Daniel Berehulak / Getty Images)

A stranded northern bottlenose whale, which has made its way to the River Thames, comes up for air in front of the Battersea Park Pagoda.  (Richard Lewis / EPA)

A whale’s progress along the River Thames is closely monitored in central London.  (Richard Powell / EPA)

Whale swims past the Houses of Parliament as it travels up the River Thames.  (British Divers Marine Life Rescue / Getty Images)