1. Aleppo, Syria
One of the most dangerous regions in the world, Aleppo, Syria is the largest city and hub for ancient history, sports, culture, arts, and education. The city is also known for the Syrian civil war that began in 2011. It was the front line of the Syrian civil war. According to the source, Aleppo, Syria is on the mend, and populations of it are returning to rebuild their lives. Such travelers planning to visit Aleppo, Syria should avoid traveling in Aleppo, Syria. This city does not maintain its own travel advisory or diplomatic support guide for travelers, so it is not safe for foreigners to travel to.