Currently, the two highest peaks of Unzen are Mount Fugen (1359m) and Heisei Shinzan (1483m) . Until the last period of volcanic activity, Mount Fugen was the highest point in the Unzen complex. It lost this title with the growth of a new lava dome that has been named Heisei Shinzan. At 1483 meters, the new peak outperforms Mount Fugen by more than 100 meters. Mount Fugen makes for a fantastic access point from the Unzen Hot Spring town and can be well combined with a visit of Shimabara to the east as well as the town of Obama to the west for a great day out! Combine all 3 places and your day will just about be perfect from every point of view.
Mount Fugen Nagasaki is one of my favorite places to visit, just to see the huge lava dome sends shivers up my spine no matter where i am standing on the Shimabara Peninsular. Mount Fugen Nagasaki can be climbed, it can be viewed also in various way, one by walking up to the lookout which is only about 200 metres from the carpark but there are quite an amount of stairs to contend with and secondly from the ropeway which will take you right up to the peak and within the parameters of its heart and soul. I am sure it will provide you with a similar moving experience where ever it may be viewed from.