Research-City of the Future

Perhaps one of Da Vinci's most impressive imaginings in terms of sheer scope, his ideal city was a picture of a utopian settlement.
It was designed in response to the Black Plague sweeping Milan at that time, and focused on sanitation and hygiene.
It was designed on various levels based on cleanliness with specific channels for water distribution to each house and canals to remove waste from the city. Ideas that mirrored modern-day plumbing.