Achieving World Heritage status requires several steps, including selection as a domestic candidate by the Council for Cultural Affairs. While the earliest possible registration date for Hikone Castle is 2027, a joint nomination with other castles could delay the process. The current evaluation by the ICOMOS is valid for five years, meaning Japan must submit a formal nomination within this period or undergo a new preliminary assessment. Hikone Castle was first added to UNESCO's tentative list of properties suitable for the World Heritage List in 1992. The popular tourist site features a keep, which is designated a national treasure, moats, stone walls, a garden and the remains of a palace and residences for high-ranking samurai. The complex is the only remaining example of an Edo Period castle where all these structures have been preserved together, according to the city of Hikone. However, the World Heritage registration of Himeji Castle in 1993 has made it challenging to differentiate Hikone Castle as a unique example of a Japanese castle from the same era.