Architecture of Mongolia
The Xiongnu confederation ruled present-day Mongolia from the third century BCE through the first century CE, living in portable, round tents on carts and round yurts. The Xiongnu aristocracy lived in small palaces, and their villages were protected by huge walls. S. I. Rudenko also mentions capital construction built of logs. Archaeological excavations indicate that the Xiongnu had towns; their chief city was Luut Hot (Dragon City).
List of ancient great powers
The Great Wall of China had been constructed to protect Chinese towns from the Xiongnu attacks. While the Chinese were trying to bring the Xiongnu under control, something of high significance happened: cross-cultural encounters. A large variety of people (such as traders, ambassadors, hostages, parents in cross-cultural marriages, etc.) served as helpers that passed on ideas, values, and techniques across cultural boundary lines. These encounters helped cultures learn from other cultures. Xiongnu empire disintegrated into two parts during the 1st century, eventually the Xiongnu fell due to the defeat in the Han–Xiongnu War.Huns were nomadic people who were known for their hordes of mounted archers. Their language seems to be Turkic; but Mongolic, Yeniseian, Uralic etc., are also postulated. After 370 under a certain Balamber they founded an empire in the East Europe defeating Alans and Goths. They triggered the great migration which eventually caused the collapse of the West Roman Empire.