The two enormous buildings of this giant hive of bureaucracy are an Orwellian architectural masterpiece designed by noted architect Kenzo Tange. The main reasons to come here, though, are the twin observatories. At a height of 202 m on the 45th floor, they have some of the best views of Tokyo. The North Observatory is open daily from 09:30 to 23:00 (closed second and fourth Mondays of each month), while the South Observatory is open daily from 09:30 to 17:30 (until 23:00 on the days the North Observatory is closed; closed on the first and third Tuesdays of each month). Last entry is 30 minutes before closing.