Why Cities Are Designed in Grids

Look at a map of a city from above.

Some places twist and wander with curving streets and irregular neighborhoods. But others look almost mathematical—straight lines, repeating blocks, and intersections that stretch for miles.

In this episode of Curious by Design, we explore why so many cities are built on grids and how this simple pattern became one of the most powerful tools for organizing urban space.

The idea dates back more than two thousand years to the work of Hippodamus of Miletus, an ancient Greek planner who believed cities could be arranged rationally using streets that intersect at right angles. The concept later influenced Roman settlements, military camps, and eventually modern cities like New York, Chicago, and Phoenix.

Grids make cities easier to navigate, easier to build, and easier to maintain. Streets repeat in predictable patterns. Infrastructure like water, electricity, and transit can run in straight lines. And when traffic builds up, drivers and pedestrians have multiple routes to reach the same destination.

But grids also come with tradeoffs. They don’t always follow natural landscapes, which is why cities like San Francisco climb steep hills and others produce strange intersections where grids collide.

What looks simple from above is actually the result of centuries of experimentation in how humans organize space.

The next time you look at a city map, notice the pattern beneath it—an ancient design that still helps millions of people move through modern cities every day.

That’s Curious by Design.

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