Join一 科学与技术 upcoming events being held in San Diego de la Unión. San Diego de la Unión is a picturesque city in the Mexican state of Guanajuato, known for its well-preserved colonial architecture, vibrant cultural scene, and rich history, which includes being the site of a significant battle during Mexico's War of Independence, making it an ideal destination for those seeking to immerse themselves in the country's past while enjoying its present-day charm.