Located at the foot of Mt. Okoji in Sanuki City, Kagawa Prefecture, and adjacent to the 88th temple of the Shikoku Pilgrimage, Okoji Temple, the Astronomical Telescope Museum is the world’s only museum dedicated exclusively to astronomical telescopes. The museum cleverly repurposes an abandoned elementary school building. Former classrooms now display small telescopes donated by individuals, evoking a warm sense of history; the old indoor pool houses imposing large telescopes from observatories across the country. This blend of old and new creates a fantastical scene with striking visual impact. With more than two hundred telescopes in its collection, the museum not only traces the development of astronomical observation in Japan but also brings together many classic models that people dreamed of owning as children. The staff focuses on restoration and active preservation so these instruments are not merely static antiques but ready-to-use tools that can be pointed at the night sky, captivating astronomy enthusiasts. Around 125 dedicated volunteers run the museum, more than half of whom come from outside the prefecture. By day, the museum offers in-depth tours and hands-on workshops guiding visitors to observe sunspots; by night, it holds viewing sessions that use the collection’s telescopes to capture the splendor of the planets. These instruments, once destined for retirement, are reborn here and lead visitors to look up again at the grandeur of the universe. In the mountain air far from city noise, the pure starlight is enough to make one forget the manmade neon of urban life.