TOKYO — From the shrines of Nikko and the temples of Kyoto to the castles of Matsumoto and Himeji, the Japanese are fiercely proud of the country’s centuries-old monuments of cultural heritage. Not so for a 113-year-old carousel in the nation’s capital.... “ We would always come in the summer.” Yet those visits ended some 30 years ago.... “ I really want them to find a place for it, ” she said. Nostalgia, though, is fleeting....