The Great Exhibition in Hyde Park 1851.

The enormous Crystal Palace went from plans to grand opening in just nine months.

The Great Exhibition of the Works of Industry of All Nations, also known as the Great Exhibition or the Crystal Palace Exhibition, was an international exhibition held in Hyde Park, London, England, from 1 May to 15 October 1851 and the first in a series of World's Fair exhibitions of culture and industry that were to be a popular 19th century feature.