"Sandcastle Day" on August 17 is an unofficial holiday that celebrates the art and joy of building sandcastles. This delightful occasion encourages people of all ages to visit beaches and unleash their creativity in the sand. While its origins are not well-documented, the day has gained popularity as a fun way to enjoy summer, connect with nature, and indulge in a bit of childhood nostalgia. Whether you're a master sand sculptor or a casual beachgoer, Sandcastle Day offers a perfect excuse to grab a bucket and shovel and transform a pile of sand into a masterpiece.