Located in Shinjuku, the Tokyo Metropolitan Government Building has two observation towers, both free to access. Shinjuku Station can overwhelming, but thankfully there are English signs and a direct path that will lead you straight to the building.
Both towers place panels in front of select windows to label the buildings in view. Some of the places visible from both towers are Tokyo Dome, Tokyo Tower, SkyTree, and even Mt. Fuji! Unfortunately it was a bit cloudy and rainy when we visited, so Mt. Fuji wasn’t quite visible, but it’s nonetheless a great feature of the Tokyo Metropolitan Government Building (besides the free admission!). Visiting both towers is a must, so be sure to check it out. Keep in mind that the view during the day and night give different atmospheres, so plan accordingly.