1865 International Exhibition
The Exposição Internacional do Porto, known in English as the International Exhibition of 1865, was a world's fair held in the Portuguese city of Porto. The exhibition was housed inside the grand Palácio de Cristal, which was modelled on the synonymous Crystal Palace erected for The Great Exhibition held during 1851 in London.
Source: Wikipedia — 1865 International Exhibition (CC BY-SA 4.0)