1. Celtic Civilization
Celtic has a great reputation as a hunter's head, and is famous for putting the victim's head in their train, and in front of their house. Many Celtic fight naked (to surprise their enemies) and famous for their long iron sword. They cut off the head of an enemy in battle and attach them to their necks. Blood-stained spoils they submit to their maids and sing victory songs, and they are nailing the enemy's head on top of their house, just like the hunter who put the head of game animals.
2. Maori Civilization
The Maori were the first settlers of New Zealand - arriving many centuries before the Europeans. Their culture prior to the early modern era. They have been known to practice cannibalism during warfare. In October,, 1809 a European convict ship was attacked by a large group of Maori warriors, revenge for the maltreatment of children of a chief. Maori killed most of the 66 people in it, and take the victim to death and life of the boat and returned to shore to eat. Only a few people could survive, which could find a hiding place inside the mast, horrified when they saw their friends shipload of Maori eaten all night.
3. Mongolian Empire
Mongols were considered barbarians and savages. They dominate Europe and Asia and the most famous cavalry, led by one of the greatest military commanders in history, Genghis Khan. They are very disciplined and master with a bow and arrow on the horse. They use a composite bow that can tear through armor, and also both with spears and scimitars. They are the masters of psychological warfare and intimidation, and build the second largest empire that ever existed, only smaller than the British Empire (But there is nothing scary about Tea and Crumpets). It all started when Temujin (later known as Genghis Khan), swore in his youth to bring the world at his feet. He almost succeeded. Then he set sights on China, and the rest is history. From Vietnam to Hungary, Mongol Empire was the largest contiguous empire in human history.
4. Apache Tribes
Apache is like a American ninja America. They would sneak up behind you and slit your throat, without you knowing it. They used primitive weapons made mostly of wood and bone. They are also the biggest knife fighters in the world has ever seen, and quite good with tomahawks and throwing axes. They terrorized the southwestern United States, and even the military had trouble beating them. They are the best guerrilla fighters, and their offspring how to teach the modern military forces fighting with bare hands. They usually skinning their victims.
5. Viking Empire
They terrorized Europe with raids and looting (though not all of them). They are ferocious in battle and use a weapon that matches their stature. They are large and use their axes, swords and spears expert in conquering the city. Even their religion about the war, and they believe that when you die in battle, once again you raised in a battle that never ends. They are ideal army that will destroy everything that hinders.
6. North Korea
Those who caught stealing food or trying to cross the border, subject to public execution. Kim went on a luxury lifestyle and obsession with the military, even though the economy collapsed. In North Korea, he and his father are deified, regarded as the savior of the whole universe. 250,000 dissidents put into "re-education camps". He has waged war against South Korea involving the killing of South Korean leaders and South Korean airliner blew up. He presents a major threat to the world in terms of nuclear war, after persuading the Soviet Union to provide a nuclear reactor, in 1984.
7. Roman Empire
While Rome may be the greatest empire, you can not ignore the horror. Criminals, slaves and others were forced to fight each other to death in the gladiatorial games. Some of the most evil person in Roman history - Caligula, Nero and others. Christian is the first group, targeted to be persecuted, by the emperor Nero, in 64 AD. Some torn apart by dogs, others burned alive as human torches. At first they were ruled by kings, then became a republic (perhaps their greatest glory) before becoming an empire. How a group of farmers, who began fending off wolves to protect their livestock, eventually became the largest empire in history is a legend. Coupled with military and administrative system is excellent, the Roman Empire, or rather of ancient Rome, is also one of the longest government. calculated from its founding until the fall of the Byzantine Empire, ancient Rome lasted 2214 years.
8. Aztec Empire
The Aztecs began their elaborate theocracy in the year 1300, and brought human sacrifice to the golden era. Approximately 20,000 people are killed each year to appease gods - especially the sun god, which requires "food" of blood every day. Victim's heart was cut, and some corpses eaten during the ceremony. Other victims drowned, beheaded, burned or dropped from a height. In a ritual for the god of rain, screaming children were killed at several sites so that their tears might cause rain. In a ritual for the goddess of corn, a virgin danced for 24 hours, then killed and flayed, his skin worn by a priest and continue dancing. A source said that at the coronation of King Ahuitzotl's, 80,000 prisoners were slaughtered to please the gods. It is said that sometimes the victim will be eaten.
9. Germany NAZI
Although civilization is very short, Nazi was a superpower, and greatly influenced the world. At least 4 million people died in the Holocaust (with some speculation closer to 11 million), and Nazi Germany started the war's worst in human history - World War II. The Nazi Swastika is probably the most hated symbols in the world. Nazi has about 268,829 square kilometers of land. Hitler was one of the most influential person who ever existed, so far, one of the most frightening.
10. Soviet Union
Communism is responsible for the deaths of millions more, even from Nazi Germany. Communists such as Josef Stalin, Mao Zedong, Pol Pot, Nicolae Ceausescu and others have killed millions of people. But the Soviet Union was the worst. Stalin, alone, killing 10-60 million people. The Soviet Union was probably one of the biggest enemies of the United States. Life under Stalin put even the most average into a state of fear, making the Soviet Union is worse than Nazi Germany, where the majority of Germans felt the level of safety as long as they support the concept of the Nazis.