Hamamatsu Castle is next to the city hall, a short bus ride from JR Hamamatsu Station (or a 20-min. walk). The main tower (seen on the left) was reconstructed in 1958.
Very easy climb up some steps to the main tower which is a ferroconcrete building housing a museum. The top floor gives a nice panorama of the city. The castle's most famous occupant was Tokugawa Ieyasu in the late 17th century before he moved to Sumpu Castle.