Sandcastle Day is observed worldwide every first Saturday of August, encouraging people to celebrate sand art by building sandcastles at the beach. The holiday promotes the enjoyment of sand sculpting, a practice believed to date back to prehistoric times, although the term "sand castle" was first recorded in the 19th century. Participants often engage in simple techniques, such as using buckets to mold wet sand, or more advanced methods showcased at sand sculpture festivals. These competitions, which began in the 20th century, have evolved into significant events, with the International Sand Sculpture Festival in Portugal being the largest. Notable records related to sand sculptures include the tallest sandcastle built in Denmark and the longest sandcastle constructed in the UK. While Sandcastle Day is a fun occasion for families and friends, it should not be confused with Sandcastle Days, an annual festival in South Padre Island, Texas.