The rise of modern architecture styles has strongly impacted the younger generation globally in the current century. This research is designed to study the performance of working memory on understanding Lanna architecture with young adults at a large university in northern Thailand, that of Mae Fah Luang University in Chiang Rai Province, Thailand. In this study, the research focuses on studying the effectiveness of young adults' working memory to discern Lanna architecture through site visits and mental visualization. The outcomes of this research can help improve architecture pedagogy in the future. For the methodology, questionnaires were used by collecting data from 412 university students from a university in northern Thailand. The data then were analyzed using mean, standard deviation, and p-value. This study concludes that the performance of working memory on the comprehension of Lanna architecture through site visits and mental visualization for young adults was positive.