Tokyo is a city of hills and bridges. That’s just one longtime resident’s casual observation, but there’s some truth to it.

If you were to zigzag your way across the Japanese capital’s central 23 wards in search of these topographical landmarks, you would traverse more than 450 bridges and 900 hills, with names like Yūrei-zaka (Ghost Hill), Fujimi-zaka (Mt. Fuji Viewing Hill), Kurayami-zaka (Darkness Hill), Hijiribashi (Sacred Bridge), Takebashi (Bamboo Bridge) and Manseibashi (Eternal Bridge).

For centuries, they were the markers for navigating streets that didn’t yet have addresses.