This is the "Great Pagoda of Peace" within the Naritasan Temple grounds.  It is currently the off season, so the temple grounds were almost empty.  It was definitely the most enjoyable temple grounds I've been to in Japan.  You enter the grounds through a 100 meter long tunnel through the mountainside.  When you emerge from the darkness, you're thrown into this huge religious complex that has existed for over 1000 years.  In fact, this year is the 1070th anniversary of the first temple.  There are probably a dozen buildings on the grounds, but this one is the largest by far.  It was built in 1984 as a symbol of peace.  Beneath the foundation they buried a time capsule with messages of peace written by the world leaders of the time.