Fukuoka Castle Ruins, located within Maizuru Park, is one of the most significant historical sites in Fukuoka. While only a few original structures like gates and turrets remain, the expansive stone walls and foundations offer a glimpse into the Edo period. The site is particularly famous as a premier cherry blossom (sakura) destination, featuring over 1,000 trees that bloom among the ruins. During the peak season, the park hosts a festival with food stalls and evening illuminations that transform the castle walls into a glowing backdrop for the blossoms.

The park is always open and admission is free. However, during the annual Cherry Blossom Festival, certain areas (such as the main keep foundations) require a paid ticket (approx. 600 yen) for entry during the evening illumination hours (18:00–22:00). The site is easily accessible via an 8-15 minute walk from Akasaka or Ohori Koen Station on the Fukuoka Subway Airport Line.