Photos of the Day: Orthodox Christians and Protesters

Cádiz, Spain

The historian Rafael Garofano shows one of the first photographic portraits produced in Spain. The image was taken by the American George W Halsey, who travelled to Cádiz in 1841 with a camera, surprising residents by producing 5cm plates in 4 minutes
Photograph: Roman Rios/EPA

Shanghai , China

A woman decorates a grave during the Qing Ming festival, also known as Tomb Sweeping Day
Photograph: Johannes Eisele/AFP/Getty Images

London, UK

Mute Swans land on the Serpentine in Hyde Park. Friday is expected to be the warmest day of the year so far in the UK, with temperatures forecast to rise to 16C
Photograph: Dan Kitwood/Getty Images