Madrid, Spain, must go to Solar Gate Square. In the centre of Madrid, it is semi-circular, with 10 streets radiating outward. It is Madrid's political activity center and commercial center. It is a historic square and a place that reflects the local conditions and customs of Madrid. The Security Bureau Building is a prominent building in the square. It is a palace-style building in the late 18th century with neoclassical style. After its completion, it served as the central post office, army headquarters and Political Department of Madrid. There are many shopping places nearby. There are many souvenir shops, many hotels and dormitories. They can be bought and returned to the dormitory to cook for themselves. The transportation is very convenient. You can go anywhere in Madrid by subway. That is to say, you should pay attention to a lot of thieves. Beautiful thieves are too rampant. Even black people rob things. Lime electric scooters can be seen everywhere in the street. It's a little expensive, pay attention to the cost, and there are many mobikes in Madrid with China.