I'll contribute a little bit now just to get the ball rolling.

The Mongol Empire was the largest contiguous empire in the world. Who knows what would've happened if it weren't for the Black Death.

In Mongolia, Genghis Khan is seen as a pretty cool guy, but in places like Iran, he's very much reviled for the death and destruction the he caused in those areas.

They also tolerated a variety of religions within their empire. A pretty good policy if you're into good governance. Traders could freely travel through the empire w/o worrying of being attacked by bandits. The mongols were also Tengrists; something I learned from playing CKII.

Genghis Khan is one of my favorite characters in Civ5 and CK2

Hint:

About Mongol fronts, they had Song dynasty (and another one) in China, Khwarizmids in Persia and Russian Kingdoms in the west in the first phase.
Later till the time of Hulagu, their enemies are the last Baghdad Caliph, Assassins, Mamluks and they kinda confronts Magyars, Teutonic Order, South East Asia and Japan.

I'll contribute more later.

This is history.

By looking at the history, we can realize that Eurovision has always been a joke!

This thread is so Euro-Asian biased.

Where are we going to see the cool pics of Peruvian mounted llama calvary?!

Not enough llama.

Yeah, we and Byzantines had lots in common, but we both were arrogant fools and fighting each other... until Barbarians came under a certain religion flag.

Sad fate of Ctesiphon, capital of Sassanian Empire:

In 636, the Muslim Arabs, who had since 633 invaded the territories of the Sasanian Empire, defeated them during a great battle known as the Battle of al-Qādisiyyah. The Arabs then attacked Ctesiphon, and seized some parts of it.

The Muslim military officer Khalid ibn 'Urfuta quickly seized Valashabad and made a peace treaty with the inhabitants of Weh Antiok Khusrau and Veh-Ardashir. The terms of the treaty were that the inhabitants of Weh Antiok Khusrau were allowed to leave if they wanted to, but if they did not, they were forced to acknowledge Muslim authority, and also pay tribute (jizya). When the Muslim military officer Sa`d ibn Abi Waqqas arrived to Ctesiphon, it was completely desolated, due to flight of the Sasanian royal family, nobles, and troops. However, the Muslims had managed to take some of troops captive, and many riches were seized from the Sasanian treasury and were given to the Muslim troops. Furthermore, the throne hall in Taq Kasra was briefly used as a mosque.

Still, as political and economic fortune had passed elsewhere, the city went into a rapid decline, especially after the founding of the Abbasid capital at Baghdad in the 8th century, and soon became a ghost town. Caliph Al-Mansur took much of the required material for the construction of Baghdad from the ruins of Ctesiphon. He also attempted to demolish the palace and reuse its bricks for his own palace, but he desisted only when the undertaking proved too vast.

Also

During the Sasanian period, population of Ctesiphon was heavily mixed, it included Arameans, Persians, Greeks, and Assyrians. Several religions were also practiced in the metropolis, which included Christianity, Judaism, and Zoroastrianism. The population also included Manicheans, who continued to be mentioned in Ctesiphon during Umayyad rule. Much of the population fled from Ctesiphon after the Arab capture of the metropolis. However, a portion of Persians remained there, and some important figures of these people are known to have provided Ali with presents, which he, however, refused to take. After the Battle of Siffin, the Persian population of Ctesiphon disappeared.