By this I mean the overstimulation of the senses that happens while you are there.
My answer is probably Old Delhi. From the sheer population density, the near-constant honking, the utter chaos on the streets, the panoply of religions and ethnicities, the myriad scents and colours that pass you by as you travel down the narrow lanes, and not least the choking air pollution, it is certain to keep you on edge, not necessarily in a bad way.
Are there other cities that come close to, or even surpass, this?
Tokyo
Bangkok / Cairo
Just personally, Old Delhi was a pleasant stroll around compared to Kolkata.
Dhaka, Bangladesh! By far the most sensory overload city in the world. If you ever go there you will know what I mean. I have been to all those cities mentioned here and they have nothing on Dhaka! The fact that you can pack that many people in that small of a size itself should be the 8th wonder of the world!
I have traveled round the globe and driven in almost every country i visited.
I will never ever want to drive in Vietnam. I couldn’t even cross the road.
I literally have to follow behind a local grandmother as she lead me across.
I’ve been to many busy cities but the one that sticks out and not in a good way is Jakarta. It’s terrible. Busy, limited, not walkable at all with crazy drivers seemingly trying to hit you on purpose or just not caring if they do. Just nope for me
Istanbul
Dhaka, Bangladesh
Tokyo for me
Dhaka.
Havent been to Old Delhi but I found Hanoi to be quite overwhelming
Varanasi - not in a bad way, but there sure is a lot going on there!
Oh gosh. A lot of the cities in India for sure, but I would add HCMC, Manila, Cairo, Dhaka, and (Jakarta, Bangkok, Bogota). Tokyo can be a lot as well but it’s almost organized chaos vs. I feel like im going to die if I took my eyes off for a second.
Medellin could be overwhelming at times, particularly if you travel there solo. Wouldn’t dream of driving there (crossing the street was enough of a challenge), constantly having to watch your back for thieves, and noisy around certain districts in and near the center of the city.
No South American entries yet so I’ll throw in Salvador, Bahia, Brazil