The garden's core is three original mansions: the Former Glover House, the Former Ringer House and the Former Alt House. All three were designated Important Cultural Properties, Glover's in 1961, Ringer's in 1966 and Alt's in 1972. And all three share a builder. Koyama Hidenoshin, a carpenter from Amakusa island, was the main craftsman behind them, and he was a pioneer of Western-style architecture in Japan. The Glover Residence was completed in 1863. It is the oldest surviving Western-style wooden building in Japan. Look for the British touches, such as chimneys, fireplaces and arched doors. Then notice how they sit alongside Japanese roof tiles and earthen walls. It is a house where two building traditions shook hands. The Ringer House dates from 1865 and was built for Frederick Ringer, a British merchant in the tea trade. Its foundation stones were brought from Vladivostok. Inside you may spot cutlery from the Nagasaki Hotel, which Ringer hoped to make one of the finest hotels in the East. The Alt House belonged to another British merchant, William John Alt, and its veranda is lined with Tuscan columns.