Tokyo Metropolitan Government Buildings, Tokyo

This building gets five stars, if you want a FREE observatory in Tokyo. The waiting times at the elevators can quite long some times, but once you get to the top, it is worth it. As far as I'm concerned, the views are spectacular, especially of Mount Fuji. Most of Tokyo's major landmarks are visible from the decks. And it is open till quite late too, so you can enjoy some great night views! The Tokyo Metropolitan Government Building is a great place to go.

Both towers have FREE observation floors. They alternate the open tower depending on the day of the week. Amazing views in all directions. You can see Mt. Fuji on a clear day. I was in the south tower and it has a little gift/snack shop, clean restrooms, water fountains, plenty of seating, and free guides who amble around and can walk you through the sites. There's even a grand piano that anyone can play. Stamp collectors take note, there is a stamp station up here! Make sure to bring something to stamp on. If you forget, you can do what I did and buy a post card for a few hundred yen and use that.