Nagoya is famous for a variety of delicious foods, but also for its history! Nagoya is where Oda Nobunaga and Toyotomi Hideyoshi were born. You can learn a little more about Nagoya's history inside the Nagoya Castle's museum.
This is not the originial castle. The original burned down during WWII from an air raid, but some artifacts survived. You can see those in the museum as well.
If you go to the top of Nagoya Castle you can view Nagoya city from a high vantage point. Walk around the observatory deck to have a 360 degree view of the surrounding area.
They have these viewfinders (that remind me of Wall-E from the Disney movie) for those buildings that are too far away to see clearly.
You can see the Nagoya Station area from here. Some of the tallest buildings in Nagoya is located there.