The first World Expo was the Great Exhibition of 1851, held in London, United Kingdom. It took place from May 1 to October 15, 1851, at The Crystal Palace, a massive glass-and-iron structure built specifically for the event in Hyde Park. 

Key Highlights of the First Expo: 

– Organized by Prince Albert, the husband of Queen Victoria. 

– Showcased industrial innovations from around the world, including the latest machinery, scientific discoveries, and works of art. 

– Featured over 100,000 exhibits from more than 25 countries, including the steam engine, early photography, and mass-produced goods. 

– Had over 6 million visitors, an enormous number at the time. 

– Generated a profit of £186,000, which helped fund cultural institutions like the Victoria and Albert Museum, the Science Museum, and the Natural History Museum. 

This event laid the foundation for future World Expos, making them platforms for innovation, international cooperation, and cultural exchange.  

There have been 34 official World Expos (Universal Expositions) recognized by the Bureau International des Expositions (BIE) since the first in 1851. They have been held in various countries across Europe, North America, Asia, and Australia.