Picture by Justin Lee of a waterfall in Yosemite National Park.
He said: 'The sun has to be in position to get the rainbow, and this photo was not planned by me beforehand. I just happened to be in the right place at the right time.
'I couldn't believe how lucky I was to see such a sight, and just had to start taking pictures straight away.'

Probably one of the best pictures I have ever seen.
