Nagano Prefecture Ontake Mountain Visitor Center Yama Terrace Otaki opened in 2021 as a contemporary facility dedicated to the natural and cultural heritage of Mount Ontake. Designed by architects Arito Hirase and Yuko Hirase of YHA Architects, the building seamlessly integrates modern architectural design with its mountainous environment. The structure serves as both a museum and information hub, providing visitors with comprehensive exhibits about the region's geology, ecology, and history. Located in Otaki Village at the base of this sacred mountain, the center exemplifies thoughtful design that honors its dramatic natural landscape while offering functional spaces for education and community engagement.