Expo 1851 London
Image: Public domain
Generally considered to be the first World Expo, the Great Exhibition of 1851 took place in the landmark Crystal Palace. The event was created by Prince Albert with Henry Cole.
Joseph Paxton designed the new structure, the Crystal Palace. It was a novel building at the time having been made of cast iron and glass. Along with exhibits, the insides also housed trees and statues along the main walkways.
The building was moved to a new park after the exposition, but destroyed by fire in 1936.