Lord Masamune chose Mount Aoba for the location of his castle when he built it in 1600. Masumune is often depicted with his famous helmet featuring a moon crescent. Unfortunately the castle was destroyed by bombing during the war but the main wall was reconstructed and the site offers a great view of the city of Sendai. The Gokoku Shrine, which is affiliated to Tokyo’s Yasukuni shrine, is also located on site.
The AER building, located nearby Sendai’s central train station, features an observatory on its 31st floor. The observatory has two separate sides, one facing south and the other north. The latter offers a nice view of the city center. Access to the observation deck is free. Opening hours are from 10:00 to 20:00.