Fukuoka Castle was built over 7 year period between 1601~1607 during the Keicho era. Fukuoka Castle is also called “Maizuru Castle”, due to the fact that when seen from the sea, it resembles a crane flapping its wings. (Maizuru means “dancing crane.”) In the grounds of the castle, a plant called Cyperus ohwii also grows naturally. Cyperus ohwii is a protected species that is designated an endangered species. The tenshudai (the raised foundation upon which the principal tower was constructed) is famous for cherry blossom viewing in the spring, in addition to having been converted into an observation platform. It is designated a national historic site. A festival of lights also took place at the Fukuoka Castle Ruins. This was an exhibit by a digital artist group called “teamLab.” The area was turned into a wonderland of lights that changed colors as you touched them. The 60m (197ft) long 10m (33ft) high stone canvas that projected animals may have been the favorite for many.