Tokyo is a city of contrasts. It is both hyper-modern and steeped in tradition. It is known for art, architecture, design, and fashion, yet it's also a city that — through its built form — makes the argument that architecture is irrelevant.
While the city certainly has countless examples of remarkable architecture, the vast majority of its buildings are arguably just that — buildings. They are a nondescript part of the urban fabric that give back through their siting, scale, rhythm, and mix of uses rather than their raw architectural qualities. Sometimes you may not even be able to see the building past all the signage.
If you were looking for a city to support the argument that urbanism matters more than architecture, I think Tokyo would be a good place to start.
What Tokyo does so successfully is ground-up urbanism (as opposed to top-down master planning). Flexible permissions, mixed-use zones by default, and an orientation around rail have allowed Tokyo to organically evolve into one of the most livable global cities on the planet.
In fact, I think you'd be hard-pressed to find any city of this magnitude that is simultaneously this livable. Which makes me wonder: Are we spending too much time worrying about architecture?
It is common for big cities to have design review processes. These typically consist of a panel of experts who evaluate new development proposals based on their architectural and urban design qualities. The comments that come back might suggest that a long facade be visually "broken up," or that additional stepbacks be introduced in order to mitigate the impact on the street and improve sky views. It's a process that can be lengthy.
But what Tokyo tells us is that, while architecture matters a great deal, it may not be the most important thing to focus on from a city-building standpoint. What matters more is the space and relationship between these buildings, the uses and permissions granted to their occupants, and the overall relationship to transit infrastructure. Here, urbanism is more critical than architecture.
If you buy this argument, then design review panels aren't actually our most pressing priority. Instead, what we should have is a kind of urbanism review panel. But rather than react to new developments, its job would be to go out and proactively identify and fix bad urbanism: this street is too narrow, this street is too wide, OMG what were we thinking here, and so on.
Then, when a new development proposal comes along, this panel would get out of the way and let the market decide what it wants to be. It would trust that it had done its job and laid the right preconditions for good urbanism to emerge.
Sounds weird and unsettling, doesn't it? Except, we might be pleasantly surprised by what it would lead to.
Cover photo by Fred Nassar on Unsplash
It's not always as straightforward as it may seem to measure the size of a city or urban region.
There's the problem of which urban boundary to use. And then once you've landed on that, there's the additional problem of estimating how many people live within it. This can be particularly challenging when it comes to informal settlements, where there isn't reliable population data.
The most common approach is to use the continuous built-up area as the urban agglomeration, as opposed to any sort of "city proper" boundaries. And this is exactly what the United Nations has done in its latest World Urbanization Prospects report.
Here, they have fundamentally revised their measurement methodology by using a new, so-called harmonized geospatial approach. If you'd like to nerd out on the specifics, you can do that here.
But one of the key takeaways is that this new methodology has resulted in a reordering of the world's largest urban agglomerations. At the top is now Jakarta, followed by Dhaka:
Whether you live in North Dakota or Texas, there's a reasonable chance that when you travel internationally, you enjoy going to Cancun. Or perhaps you fly into Cancun and then go to a neighboring town like Tulum. United Airlines just released the following map showing the most-booked international destinations from every state for passengers traveling on United Airlines between January and October 2025. The top three destinations are London, Cancun, and Tokyo:
Tokyo is a city of contrasts. It is both hyper-modern and steeped in tradition. It is known for art, architecture, design, and fashion, yet it's also a city that — through its built form — makes the argument that architecture is irrelevant.
While the city certainly has countless examples of remarkable architecture, the vast majority of its buildings are arguably just that — buildings. They are a nondescript part of the urban fabric that give back through their siting, scale, rhythm, and mix of uses rather than their raw architectural qualities. Sometimes you may not even be able to see the building past all the signage.
If you were looking for a city to support the argument that urbanism matters more than architecture, I think Tokyo would be a good place to start.
What Tokyo does so successfully is ground-up urbanism (as opposed to top-down master planning). Flexible permissions, mixed-use zones by default, and an orientation around rail have allowed Tokyo to organically evolve into one of the most livable global cities on the planet.
In fact, I think you'd be hard-pressed to find any city of this magnitude that is simultaneously this livable. Which makes me wonder: Are we spending too much time worrying about architecture?
It is common for big cities to have design review processes. These typically consist of a panel of experts who evaluate new development proposals based on their architectural and urban design qualities. The comments that come back might suggest that a long facade be visually "broken up," or that additional stepbacks be introduced in order to mitigate the impact on the street and improve sky views. It's a process that can be lengthy.
But what Tokyo tells us is that, while architecture matters a great deal, it may not be the most important thing to focus on from a city-building standpoint. What matters more is the space and relationship between these buildings, the uses and permissions granted to their occupants, and the overall relationship to transit infrastructure. Here, urbanism is more critical than architecture.
If you buy this argument, then design review panels aren't actually our most pressing priority. Instead, what we should have is a kind of urbanism review panel. But rather than react to new developments, its job would be to go out and proactively identify and fix bad urbanism: this street is too narrow, this street is too wide, OMG what were we thinking here, and so on.
Then, when a new development proposal comes along, this panel would get out of the way and let the market decide what it wants to be. It would trust that it had done its job and laid the right preconditions for good urbanism to emerge.
Sounds weird and unsettling, doesn't it? Except, we might be pleasantly surprised by what it would lead to.
Cover photo by Fred Nassar on Unsplash
It's not always as straightforward as it may seem to measure the size of a city or urban region.
There's the problem of which urban boundary to use. And then once you've landed on that, there's the additional problem of estimating how many people live within it. This can be particularly challenging when it comes to informal settlements, where there isn't reliable population data.
The most common approach is to use the continuous built-up area as the urban agglomeration, as opposed to any sort of "city proper" boundaries. And this is exactly what the United Nations has done in its latest World Urbanization Prospects report.
Here, they have fundamentally revised their measurement methodology by using a new, so-called harmonized geospatial approach. If you'd like to nerd out on the specifics, you can do that here.
But one of the key takeaways is that this new methodology has resulted in a reordering of the world's largest urban agglomerations. At the top is now Jakarta, followed by Dhaka:
Whether you live in North Dakota or Texas, there's a reasonable chance that when you travel internationally, you enjoy going to Cancun. Or perhaps you fly into Cancun and then go to a neighboring town like Tulum. United Airlines just released the following map showing the most-booked international destinations from every state for passengers traveling on United Airlines between January and October 2025. The top three destinations are London, Cancun, and Tokyo:
Previously, Tokyo was thought to be the world's most populous megacity, but it has dropped down to 3rd in this new report. And by 2050, it is forecasted to drop even further to 7th place:
As we spoke about yesterday, the world's economic center of gravity is rapidly shifting toward Asia. And that shows up in these charts.
I have a strong desire to visit the largest cities in the world. It's fascinating to see how such large urban clusters manage to organize themselves. There are always systems that naturally emerge to make things work, even if it feels chaotic on the surface.
I've only been to 3 cities from the 2025 chart, so I have my work cut out for me.
Cover photo by Rifki Kurniawan on Unsplash
First, it's important to keep in mind that this data only includes people flying on United; it doesn't capture all international air travel. Second, maps like this are necessarily going to be influenced by an airline's biggest hubs. In the case of United, its hub-and-spoke model relies on major airports and routes like San Francisco-Tokyo and Newark-Heathrow.
Still, specific destinations appear on this map for a reason. Cancun is the number one "vacation" airport for Americans, which is an incredible success story, because it wasn't a place until the 1970s. Prior to Cancun, Acapulco was Mexico's top resort destination, but it was becoming constrained, and the government needed a replacement conduit for extracting US dollars from the American middle class. So, they developed Cancun.
The popularity of Tokyo is likely partly a result of a weaker yen, in addition to being an important Asian hub and an incredible place to visit. According to the Japan National Tourism Organization (JNTO), over 2.7 million Americans visited the country in 2024 — a 33% year-over-year increase and a 58% increase compared to 2019.
The country also saw 3.7 million international visitors in January 2025, which is the highest ever for a single month. Countries like the US and Canada also set all-time records for January arrivals. Part of this, I'm sure, has to do with Japan's legendary "Japow." I was part of this year's cohort, and I've never seen so much snow as I did on the island of Hokkaido.
There are also very specific one-off relationships that appear on United's map. The number one destination for the state of Arizona is, for example, Taipei. And this is being driven by a semiconductor boom, specifically Taiwan Semiconductor Manufacturing Company's direct investment in the state. At the time, it was heralded as "the largest foreign direct investment in a greenfield project in American history."
So, there's a lot that can be gleaned from a map like this. If we were to zoom out and look at all international air travel, we would likely see some reordering. I suspect Paris would jump ahead of airports like Vancouver, given its hub status for other airlines. But it's unlikely you'd see a completely different list. Americans fly east to London, south to Cancun, west to Tokyo, and north to Toronto. These are the primary hub airports.
Previously, Tokyo was thought to be the world's most populous megacity, but it has dropped down to 3rd in this new report. And by 2050, it is forecasted to drop even further to 7th place:
As we spoke about yesterday, the world's economic center of gravity is rapidly shifting toward Asia. And that shows up in these charts.
I have a strong desire to visit the largest cities in the world. It's fascinating to see how such large urban clusters manage to organize themselves. There are always systems that naturally emerge to make things work, even if it feels chaotic on the surface.
I've only been to 3 cities from the 2025 chart, so I have my work cut out for me.
Cover photo by Rifki Kurniawan on Unsplash
First, it's important to keep in mind that this data only includes people flying on United; it doesn't capture all international air travel. Second, maps like this are necessarily going to be influenced by an airline's biggest hubs. In the case of United, its hub-and-spoke model relies on major airports and routes like San Francisco-Tokyo and Newark-Heathrow.
Still, specific destinations appear on this map for a reason. Cancun is the number one "vacation" airport for Americans, which is an incredible success story, because it wasn't a place until the 1970s. Prior to Cancun, Acapulco was Mexico's top resort destination, but it was becoming constrained, and the government needed a replacement conduit for extracting US dollars from the American middle class. So, they developed Cancun.
The popularity of Tokyo is likely partly a result of a weaker yen, in addition to being an important Asian hub and an incredible place to visit. According to the Japan National Tourism Organization (JNTO), over 2.7 million Americans visited the country in 2024 — a 33% year-over-year increase and a 58% increase compared to 2019.
The country also saw 3.7 million international visitors in January 2025, which is the highest ever for a single month. Countries like the US and Canada also set all-time records for January arrivals. Part of this, I'm sure, has to do with Japan's legendary "Japow." I was part of this year's cohort, and I've never seen so much snow as I did on the island of Hokkaido.
There are also very specific one-off relationships that appear on United's map. The number one destination for the state of Arizona is, for example, Taipei. And this is being driven by a semiconductor boom, specifically Taiwan Semiconductor Manufacturing Company's direct investment in the state. At the time, it was heralded as "the largest foreign direct investment in a greenfield project in American history."
So, there's a lot that can be gleaned from a map like this. If we were to zoom out and look at all international air travel, we would likely see some reordering. I suspect Paris would jump ahead of airports like Vancouver, given its hub status for other airlines. But it's unlikely you'd see a completely different list. Americans fly east to London, south to Cancun, west to Tokyo, and north to Toronto. These are the primary hub airports.
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