If you plan to visit Japan, do visit the Imperial Palace. You’ll find a blend of modern and natural environment there. The beautifully constructed houses and bridges along with the greeny nature will overwhelm you.
Einstein visited Japan in 1922 for giving some lectures. The emperor and empress invited Einstein to meet him at the Imperial Palace. It’s no wonder that thousands of people came there to witness the historical event. He praised Japanese for their modesty, intelligence and their authentic feelings for art in a letter that was written to his sons.
Source: Wikipedia
The emperor was an intelligent person as well. He had a deep interest in marine biology and he was well-informed as well. The palace had a laboratory where the emperor used to research. He even published some papers from there under his personal name "Hirohito" on marine biology.
Source: Wikipedia