The document discusses the architecture of Japan's Kansai region across different historical periods. It notes that the oldest existing buildings in Japan are from the Asuka period in the 7th century and were made of wood. Architecture evolved during the Heian period with the introduction of ceramic tile roofs and wood flooring. A notable example from this era is the Phoenix Hall built in 1053 near Kyoto. Architecture further developed during the Kamakura period through influences from Korea and China, featuring wooden construction and tile roofs. After World War 2, modern steel and concrete buildings replaced traditional wooden structures as Japan rebuilt its cities.