Modern art museums are a difficult thing to get right, however I'm pleased to say that Mori Art Museum and the exhibitions at the time of my visit did not disappoint. A particular highlight for me was the "Future and the Arts" exhibition, which featured visually engaging and thought provoking exhibits raising questions about the future development of humankind, keeping me occupied for many hours. Obviously your experience will depend on the exhibitions so be sure to check in advance. In addition, there is a an open air observation deck which offers great views of Roppongi and Tokyo due to its central location, but unfortunately it was closed due to weather conditions. One issue is the fact that the pricing at the entrance of the museum is not entirely clear and the staff did not manage to clearly explain the differences between the ticket types. As I understood there are different lines for different tickets that allow you entrance to either a specific exhibition or all of them plus the observation deck. The confusing part is that I went for the shortest line and cheapest tickets and still got to visit all of the exhibitions. Besides the puzzling nature of the pricing the Mori Art Museum is a fantastic way to spend 3-4 hours and is definitely worth a visit.