This is a short summary from https://www.getyourguide.com/magazine-staging/2018/08/8-megacities-to-visit/
They are the largest cities and one of the most exciting attractions in our world. Every city has different things and attractions to offer and is special in its own way. If you decide to travel to one of these cities be ready for the buzz of voices and traffic but also for different culture, local food and much more. When visiting megacities like these, always make sure you are ready because it can get very exhausting.
- Tokyo, Japan
Tokyo is the capital and the largest city of Japan and it has a lot to offer. It attracts travelers from all around the world that are looking for fantastic cuisine, pop culture spots, fancy hotels, classical gardens and the most important thing the world’s tallest freestanding tower. Fans of anime should not forget to visit "Nakano Broadway" which is a giant shopping center where you can buy figurines, books and another products.
2. Jakarta, Indonesia
Jakarta, the capital of Indonesia is a very chaotic city that represents great food, culture, shopping and nightlife. If you want to learn about Indonesia's history there is not a better place to visit. Old town and the port will give you an idea about how the city used to look like in old times. When visiting this city, you can see skyscrapers, age-old mosques, markets and don’t forget to stop by clubs or bohemian bars.
3. São Paulo, Brazil
This city has a little bit of everything. It is very culturally based and is proud to have a multiple art museums around all around the city but also art-house cinemas, theaters and many many bars. It is very international and definitely worth visiting.
4. Seoul, South Korea
Seoul is famous for being very traditional, historical but also for their advanced technology and subways system which helps you never get lost. Don't forget to visit traditional Korean food restaurants and Gwangjang market where you can try local street food.
5. Moscow, Russia
Moscow is a fascinating city that has a great amount of museum and galleries. It is also known for its breathtaking architecture - be sure to visit the Kremlin and Red Square. The best time to visit Moscow is during the summer season because in the winter it gets very very cold.