20. One Love
If no other photograph captures the sheer joy and ecstasy that was Woodstock, then this one certainly does. The organizers of the festival were worried the hippies and heavy metal music would cause violence, but there was nothing of the sort reported from the music festival.
For three days straight, all that was palpable at Woodstock was unity, peace, happiness, and a sense of freedom. Look at this crowd clapping their hands in the air to the music with massive smiles on their faces. We can feel the excitement emanating from this image.