3. San Francisco
One of the most popular cities in the United States, the cradle of technology, San Francisco is one of the most developed cities in the world. Apple, Google, Twitter, Facebook, and world-renowned technology innovators are located in the Silicon Valley in San Francisco.
San Francisco isn’t just technology, it’s about gender equality, human rights, anti-racism, and so on. The city is also very advanced in terms of important issues such as. San Francisco is the innovation center and one of the top 10 modern cities in the world.