KYOTO—One of the main buildings at Nijo-jo Castle here, a UNESCO World Heritage site, will reopen to the public on Sept. 1 after being closed for 17 years, the city government announced on June 17.

Discover Kyoto, a world of imperial residences and shogun castles, palaces and villas, where every architectural detail speaks volumes about the authority and refinement of traditional court life.

The excavation of ruins of the last castle built by the warlord Toyotomi Hideyoshi is being hailed as the greatest discovery in Japan of this century. While there have been references in the ...