From its origins — whether in Ancient Rome, medieval England, or Renaissance Europe — to today, April Fools' Day has always capitalized on a long-held human tradition: silliness.

April Fools' Day falls on a Tuesday this year. The unofficial holiday is celebrated on April 1 every year. April Fools' Day is not recognized as a holiday in any country except for Odessa, Ukraine, where April 1 is an official city holiday. It is not a federal holiday in the U.S., although the tradition of playing pranks and jokes still goes on.

While it’s not an official holiday, April Fools’ Day is celebrated across the world, with individuals and even major brands joining in on the fun. But where did this tradition of playful ...