In 1861 – only 10 years after it had been ‘discovered’ –
Carleton E Watkins wandered the Yosemite valley, with
camera equipment that weighed close to a tonne strapped to
his team of mules, and snapped the awesome images that
inspired Abraham Lincoln to secure the world’s first national
park. Here is a selection of those images by one of the
world’s earliest environmentalists.