The castle building was destroyed in the Meiji Period, but part of the inner and outer trenches still survive. Because of this, the castle still has the feel of an authentic site prepared for whatever attacks may come.
It can be accessible by train.
The closest station is the Koriyama station on the Kintetsu line which is a 15-minute or so walk from the castle.
JR Koriyama station is also possible, although it involves a difficult-to-follow 25-minute walk.
When creating the wall of the castle, Hidenaga Toyotomi ran out of materials to make the splendid, intimidating wall that he had envisioned. Instead of leaving his wall unfinished, he decided to take whatever stone he could get his hands to finish the protective barrier.
Now the wall at Koriyama castle is considered one of the most fascinating sights in the area because of Hidenaga's clever solution. Instead of plain rocks, the ruler used grave stones, Buddhist engravings, garden stones and even an image of a Jizo, a Deity typically associated with children and protection, to finish his wall.
In order to find the hidden statue of the boddisativa Jizo near the top of the castle, circle the top level of the castle instead of climbing to the very top and it can be found in a small alcove, upside down.
Look for the money that visitors leave as offerings and the white wooden arrows to find the correct location.
Fans of cherry blossom should check out the Oshiromatsuri festival which is held from late March to the beginning of April. The nighttime illumination of the castle and its flower-filled trees is one of the highlights of the festival.