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Here's an ideal itinerary for 3 days in Nagoya:
Atsuta Shrine is one of the most important Shinto shrines in Japan, located in Nagoya. It is said to house the sacred sword Kusanagi no Tsurugi, one of the three imperial regalia of Japan. The shrine is surrounded by a beautiful forest and has many buildings and structures that are designated as important cultural properties.
The Toyota Commemorative Museum of Industry and Technology in Nagoya showcases the history of Toyota's technological advancements and industrial development. Visitors can explore exhibits on weaving, automobiles, and robotics.