Mt. Inasa in Nagasaki offers one of best night views in Japan. While beauty arguably lies in the eye of the beholder, the view of Nagasaki illuminated at night seen from the mountain has been named one of the world's three best night views alongside Monaco and Hong Kong, and one of the latest top three in Japan alongside Sapporo and Kobe. The top of the mountain can be accessed by hiking or by ropeway. Even if you can't make it at night, the day time view is stunning, too. You will be able to see Nagasaki city as well as the many islands off the coast.
Photograph provided by Nagasaki Prefecture Convention and Tourism Association