We can't be sure whether it must exist or not. It can only be said that we have no exact historical data to prove its existence. 1. Lemurian civilization Lemuria, also translated as Lemuria, is a legendary land in the southern Indian subcontinent, also known as Kumaranadu or Ku Marican Dam. It is located in the Indian Ocean, between Madagascar and Tamil Nadu. The legend of Lemuria often appears in metaphysical works. People think that Lemuria is related to the ancient civilization on the earth. It once had a high civilization, but now it sank to the bottom of the sea because of a disaster thousands of years ago. The legend of Lemuria continent is no longer taken seriously after the prevalence of plate activity theory, because there is no trace of crustal movement in the continent. Lemuria is also translated as "Lemuria Island", because in the early years, according to the land bridge hypothesis, lemurs would not have their present distribution if there was no land bridge between Madagascar and India (Lemuria Island). Maya civilization Maya civilization is a modern jungle civilization distributed in southeastern Mexico, Guatemala, Honduras, El Salvador and Belize. Although in the Neolithic Age, it made great achievements in astronomy, mathematics, agriculture, art and writing. Maya civilization, named after Indian Maya, is a great civilization independently created by American Indian Maya in isolation from ancient civilizations in Asia, Africa and Europe. Its websites are mainly distributed in Mexico, Guatemala and Honduras. Maya civilization was born in 10 century BC, and it can be divided into three periods: pre-classical period, classical period and post-classical period, among which the 3rd to 9th century AD was its heyday. Maya civilization was an amazing achievement made by mankind before Columbus discovered America. Great contributions have been made in science, agriculture, culture, art and many other aspects. Comparatively speaking, the other two great civilizations born in this land in the Western Hemisphere-the Aztec civilization and the Inca civilization-are not the same as the Mayan civilization. However, it is puzzling that, as the only ancient civilization in the world that was born in a tropical jungle rather than a river basin, Mayan civilization, like its miraculous rise and development, is full of mystery. In the 8th century, the Mayans abandoned the highly developed civilization and migrated on a large scale. Every central city created terminates new buildings, the city is completely abandoned, and the prosperous big city becomes barren. Maya civilization disappeared in the tropical jungle of America overnight. In 1930s, john stephens, an American, first discovered the ancient Mayan civilization in the tropical jungle of Honduras. Since then, archaeologists all over the world have discovered many abandoned Mayan ruins in the jungles and wasteland of Central America. In the absence of metal tools and means of transportation, the Mayans only relied on the primitive production tools of the Neolithic Age to create a splendid civilization. Some people say that the center of the earth is hollow, and there is a sun in it, and there are several countries in it, but they don't want to disclose themselves. These people are called magic countries, which is what we often call underground demons. They also evolved from reptiles and have huge entrances and exits in the north and south poles. Fourth, the legend of Mars civilization was ten times that of the earth before the destruction of advanced civilization on Mars! Five, the giant giant's heavy physique and tough and cool movements have given the comrades trust and made the enemy fearful. There are records of giants in historical legends and some historical materials. However, there is still controversy about whether there is a giant. Many experts try to explain. Are there giants? Many anthropologists have definitely answered this scientific question. They think that the giant race includes Homo erectus and Homo erectus, but both of these creatures have disappeared. However, some experts believe that it is possible that in a corner of the earth, giants still live on. Of course, scholars who hold the view of the extinction of giants still account for the vast majority. Homo erectus and its remains have been found in Java, eastern and southern Africa, Mongolia, southern China and India. Anthropologists who conducted this survey don't recognize them as human beings, but only think that they are a kind of apes, not the direct ancestors of human beings. According to the size of these bones, the Soviet anthropologist Dr. Yakimov calculated that they weighed more than 500 kilograms. Probably because the growth of skull and brain can't keep up with the development of body, their evolution has stopped. Some experts believe that giants may be caused by two reasons. One is that they are normal because of genes, but genes make them grow very tall. The other is dysfunction, the most common is acromegaly, which is caused by too much growth hormone. Not only does it make people grow too tall, but it may also cause problems with bones and internal organs. So did they originate from ancient giants? Dr. Ma Wenan Timan, a scientist, thinks that if all our genes come from the first human, it is not surprising that there will be giants among us, because the first human may have recessive genes that lead to giants. For example, the people in the west of modern Watu are very huge, and the average height of men is nearly 2 meters, which is surprisingly high. However, some scholars are skeptical that there are no giants in the world. 6. Atlantis, also known as the Great Western continent and the Great Western Country, has a similar narrative in the manuscripts of ancient Mexican works preserved by the Vatican city-state (that is, the ancient manuscripts of the Vatican city-state) and the works of Mexican Indian civilization preserved to this day: "There have been four generations of human beings on earth. The first generation of mankind is a generation of giants. They are not residents here, but from the sky. They were destroyed by hunger. The second generation of mankind was destroyed by a fire. The third generation of human beings is apes, which are destroyed by killing each other. Later, the fourth generation of human beings appeared, that is, the' sun and water' stage of human beings. The human civilization at this stage was destroyed by huge waves and devastating floods. " Modern science has found that before the flood, there may have been a continent on the earth with a highly developed civilization. In a global disaster, the continent sank into the Atlantic Ocean. What caused the catastrophe was a large-scale earthquake and its tsunami. Volcanic ash plunged the whole Mediterranean region into darkness for weeks, and plants as far away as Britain were also affected. The earthquake is 4000 times as powerful as the Hiroshima atomic bomb. For nearly a century, the remains of prehistoric civilization discovered by archaeologists at the bottom of the Atlantic Ocean seem to confirm this hypothesis. People call this continent "Daxizhou" and the country that gave birth to prehistoric civilization "Daxi Country". The scientific community adopted Plato's name of Atlantis. Many historians believe that Atlantis is a myth, and Plato only used it to compare the values of Athenian society, but many archaeologists and historians hope to find it and restore it to the truth. Cyprus said that RobertSarmast, an American explorer who claimed to be an expert in mythology and ancient times, thought it was true in his book Discovering Atlantis, and took Plato's description as the main basis of his research. He said that Plato provided "concrete clues" of Atlantis, 45 of which showed that it was located in the southern waters of Cyprus, and the ancient landforms of Cyprus shown in the marine image map were consistent with Plato's description. Saskatchewan even said that he found many places mentioned by Plato, including the rectangular plain with Atlantis in the middle. The center of his theory is that there was a "flood disaster" in the ancient Mediterranean basin, which connected the Mediterranean with the Atlantic Ocean where the Strait of Gibraltar is now located. This statement is consistent with Plato's statement that there was a great flood "engulfing" Atlantis and there was a great flood. Crete put it another way, Atlantis is in Crete. Because British archaeologist Evans discovered a large-scale relic in Crete before World War II, in addition, a circular island in the north "Scylla Island" (also known as San Dorigny/Sandorini) found evidence depicting a crater, which has now become an inland sea and used to be an island. Some people suspect that Scylla Island is the origin of the legend of Atlantis, because according to research, it is about15th century BC. This volcanic eruption dealt a great blow to Minoan civilization, which originally relied on trade, and never recovered. Supporters believe that Plato (or his cousin Corinth or the Greek Soren who heard the story for the first time) got the numbers wrong, so the whole number was exaggerated by more than ten times. 900 became 9000, and 40,000 square miles became 400,000 square miles, which became such a legend. Archaeologists and writers Graham Hancock and Lance floria supported Antarctic theory. This is that Atlantis should be on the Antarctic Peninsula, and the destruction of Atlantis is explained by the theory of crustal sliding. It is believed that Atlantis was not only affected by volcanoes and other disasters, but also followed by severe cold, which led Atlanteans to abandon their hometown, and the Antarctic Peninsula was subsequently covered with thick ice. Gibraltar said that Collina-Girard, a professor of geography at the French University of Provence, believed that the "Atlantis" described in Plato's book was located in today's Gibraltar Strait. Corina studied the history of human migration from Europe to North Africa 19000 years ago, and thought that there was land above sea level in the Strait of Gibraltar during the existence of Atlantis, which was located between Andalusia and Morocco today. Ireland said that Ulf Elinson, a Swedish geographer, thought that the island of Ireland was the continent of Atlantis in his book Atlantis in the eyes of geographers: a country exploring fairyland. The main argument comes from Plato's description. The size and landforms of the island countries are very similar to those of Ireland, and they all have the culture of megalithic tombs. The legend of the sinking of Atlantis may come from 6 100 BC. The end of the ice age caused the sea level to rise and flooded many coastal islands. Long-term misinformation exaggerated that the island was in a devastating disaster. Cadiz said that some researchers believe that Atlantis is located near Cadiz, Spain. 20 1 1 year, Professor RichardFreund of university of hartford was in Dona National Park (Dona? Archaeological findings in the marshland believe that this place is Atlantis destroyed by the tsunami.